Fact-checked by Grok 2 weeks ago

CAA

The Citizenship (Amendment) Act, 2019 (CAA) is an Indian statute that amends the Citizenship Act, 1955, to facilitate naturalization for undocumented migrants belonging to six non-Muslim religious minority communities—Hindus, Sikhs, Buddhists, Jains, Parsis (Zoroastrians), and Christians—from Afghanistan, Bangladesh, and Pakistan who entered India on or before December 31, 2014. The Act exempts eligible individuals from classification as illegal migrants under the principal law and shortens the residency requirement for citizenship from eleven years to five years, aiming to address the plight of those fleeing religious persecution in these neighboring Muslim-majority states where such minorities have faced systemic discrimination, forced conversions, and violence. Enacted on December 12, 2019, amid India's long-standing tradition of providing refuge to persecuted groups—as seen historically with Tibetan Buddhists, Sri Lankan Tamils, and others—the CAA fulfills constitutional imperatives under Articles 14 and 21 to protect vulnerable refugees while distinguishing between those targeted for their faith and others. Its implementation rules were notified on March 11, 2024, enabling applications via an online portal, with initial approvals granting citizenship to over 14,000 individuals by mid-2025, primarily Hindus from Pakistan and Bangladesh who endured targeted attacks on temples and communities. The law explicitly does not apply to tribal areas in Assam, Meghalaya, Mizoram, or Tripura under the Sixth Schedule, nor to northeastern regions covered by the Inner Line Permit system, preserving indigenous demographic concerns. The CAA's passage triggered nationwide protests from late 2019 into 2020, resulting in over 50 deaths during clashes, with opponents claiming it undermines India's secular fabric by linking citizenship to religion and foreshadowing discrimination when paired with the National Register of Citizens (NRC). Defenders, including the government, counter that the Act targets only foreign migrants persecuted abroad on religious grounds—conditions not symmetrically applicable to Muslims from those countries, who form the ruling majorities there—and imposes no burden on Indian citizens of any faith, as verified by official clarifications amid biased amplifications in some international reporting. Legal challenges persist before the Supreme Court, which in 2020 stayed related police actions but has not ruled on constitutionality, highlighting tensions between humanitarian imperatives and equal-protection interpretations.

Law

Clean Air Act

The Clean Air Act (CAA) constitutes the principal United States federal statute regulating air pollution, empowering the Environmental Protection Agency (EPA) to set National Ambient Air Quality Standards (NAAQS) for six criteria pollutants—sulfur dioxide, particulate matter, nitrogen dioxide, carbon monoxide, ozone, and lead—and to enforce emissions limitations on industrial sources, vehicles, and other contributors through state implementation plans and federal oversight. Enacted December 17, 1963, as Public Law 88-206, the initial legislation focused on research funding and technical assistance to states for pollution control, responding to growing evidence of smog-related health harms in urban areas like Los Angeles, but it imposed no mandatory national standards or penalties for noncompliance. The 1970 amendments, signed by President Richard Nixon on December 31, 1970 (Public Law 91-604), marked a pivotal expansion by establishing the EPA as the enforcement authority, requiring NAAQS attainment within specified deadlines, and mandating state plans to curb emissions from stationary sources via technology controls and from mobile sources through federal motor vehicle standards. These changes addressed interstate pollution transport and hazardous emissions, with provisions for designating non-attainment areas subject to stricter controls. The 1977 amendments (Public Law 95-95) introduced offsets for new construction in polluted regions and prevention of significant deterioration in cleaner areas, delaying some 1970 deadlines amid industry pushback on feasibility. The 1990 amendments (Public Law 101-549) refined the framework with market-oriented tools, including a cap-and-trade system reducing sulfur dioxide emissions by 10 million tons annually to combat acid rain, technology-based standards for 189 hazardous air pollutants phased in via maximum achievable control technology, and enhanced oversight of urban ozone through reformulated gasoline and inspection programs. Title V established operating permits for major sources, integrating compliance tracking. Empirical data demonstrate marked air quality gains: between 1970 and 2020, national emissions of criteria pollutants fell 71% in aggregate, even as gross domestic product tripled and vehicle miles traveled quadrupled, correlating with NAAQS attainment in over 99% of monitored counties for lead and a 39% drop in fine particulate matter since 1990. New vehicles emit 98-99% less of key pollutants than 1970 models due to catalytic converters and fuel standards. EPA prospective analyses project that 1990-2020 CAA programs averted 230,000 premature deaths and yielded $2 trillion in net benefits (in 2020 dollars) from health, visibility, and productivity gains, against $65 billion in abatement costs, though these estimates rely on valuation models for avoided illnesses that some economists critique for sensitivity to discount rates and baseline assumptions. Critics, including industry groups, contend the Act imposes substantial compliance burdens—estimated at $523 billion cumulatively since 1970—disproportionately affecting energy-intensive sectors like coal mining, where plant retirements linked to sulfur rules contributed to 50,000-100,000 job losses in Appalachia, and argue that uniform standards overlook regional variations in pollution sources and costs. However, econometric reviews find no significant drag on overall employment or GDP growth, with benefits-to-costs ratios exceeding 30:1 in multiple studies, attributing gains to innovation in cleaner technologies offsetting direct expenses. Enforcement challenges persist, including litigation over NAAQS revisions and state variances, yet causal analyses link CAA designations to localized air quality lifts of 0.1-1 µg/m³ in particulate matter, underscoring its role in causal reductions absent confounding economic factors.

Organizations

Arts

Creative Artists Agency (CAA) is an American talent agency headquartered in Los Angeles, California, founded on September 23, 1975, by former William Morris Agency agents Michael Ovitz, Ron Meyer, Bill Haber, Rowland Perkins, and Michael Rosenfeld. The agency's early model emphasized collaborative representation across disciplines, pioneering "packaging" strategies where agents bundled talent—such as actors, directors, writers, and producers—into project proposals to negotiate higher fees and influence studio decisions, a practice that reshaped Hollywood deal-making by the 1980s. In the arts and entertainment sectors, CAA represents a broad roster of clients spanning motion pictures, television, music, theater, and digital content creation, positioning itself at the intersection of talent, brands, and emerging technologies like data analytics to facilitate endorsements, licensing, and multimedia deals. The agency handles representation for high-profile filmmakers, including directors and producers behind major box-office successes and critically acclaimed works, such as Steven Spielberg and Ryan Murphy, enabling comprehensive career management from script development to distribution. In music and touring, CAA negotiates performance contracts, brand partnerships, and global tours for artists, leveraging relationships with labels and venues to secure record-setting agreements. CAA's influence extends to visual arts and design through specialized agents who represent cultural innovators, facilitating collaborations between artists, architects, and luxury brands for exhibitions, installations, and commercial ventures. Notable clients include actors like Tom Hanks and Cate Blanchett, musicians such as Beyoncé and Lady Gaga, and multifaceted talents like George Clooney, whose projects often involve agency-orchestrated financing and production packages. By 2023, the agency's expansion culminated in a $7 billion majority stake acquisition by French billionaire François-Henri Pinault's Artemis group, enhancing its global reach in entertainment financing and cross-industry integrations without diluting its core talent-focused operations.

Automobile

The Canadian Automobile Association (CAA) is a not-for-profit federation comprising eight regional automobile clubs that operate across Canada, providing services primarily to vehicle owners and motorists. Established as a national entity in 1913, it coordinates efforts among its member clubs, which maintain over 100 offices nationwide and trace their origins to early provincial automobile associations formed around 1903 to promote motoring interests and infrastructure development. With more than 7 million members as of 2025, CAA ranks among Canada's largest consumer organizations, emphasizing practical support for automobile use alongside broader travel and safety initiatives. CAA's core automobile-related services center on emergency roadside assistance, available 24/7 through a network of service providers, including towing for breakdowns, flat tire changes, battery jumps, lockout assistance, and fuel delivery. Membership tiers dictate response priorities and coverage limits, with higher levels offering perks like trip interruption reimbursement for mechanical failures during travel. The association also underwrites auto insurance products, distributed via regional clubs and a dedicated insurer established in 1974, covering liability, collision, and comprehensive policies tailored to Canadian driving conditions such as winter weather and rural roads. Beyond direct services, CAA engages in advocacy for automotive consumers, lobbying governments on issues including road safety standards, vehicle technology adoption (e.g., advanced driver-assistance systems), and regulatory responses to emerging mobility challenges like electric vehicle infrastructure. It conducts annual tire studies and issues advisories on maintenance best practices, drawing on data from member interactions to inform public recommendations. Regional clubs, such as CAA South Central Ontario and CAA-Quebec, adapt these efforts locally, often partnering with automakers for member discounts on vehicles and parts while maintaining independence as consumer advocates. This structure allows CAA to influence policy without direct industry ties, though its growth into insurance and rewards programs has diversified revenue beyond dues.

Aviation

The Civil Aviation Authority (CAA) denotes national or supranational governmental bodies tasked with regulating civil aviation, including safety standards, licensing, air traffic control, and economic oversight of airlines and airports. These authorities derive their mandate from domestic legislation or international agreements under the International Civil Aviation Organization (ICAO), ensuring compliance with global standards like Annexes to the Chicago Convention. In most jurisdictions, the CAA operates as an independent regulator to balance safety imperatives with industry growth, though structures vary by country—some integrate economic regulation, while others focus solely on technical safety. In the United Kingdom, the Civil Aviation Authority, established by the Civil Aviation Act 1971 and operational from April 1, 1972, serves as the primary regulator for all civil aviation activities. It enforces safety through certification of aircraft, personnel, and operators; manages airspace policy; and handles consumer protections such as compensation for flight disruptions under EU Regulation 261/2004, retained post-Brexit. As of 2023, the UK CAA oversees approximately 1,200 licensed aerodromes and regulates over 150,000 flights annually, employing around 700 staff with a budget exceeding £100 million derived from industry fees. Its independence from direct government control aims to mitigate political influence on technical decisions, though critics have noted occasional tensions with Department for Transport policies on drone integration and net-zero emissions targets by 2050. Historically, the United States operated a Civil Aeronautics Authority (CAA) from 1938 to 1958, created under the Civil Aeronautics Act to consolidate fragmented oversight following early aviation accidents like the 1936 crash of a TWA-DC-3 that killed celebrities, prompting federal intervention. The agency issued air carrier certificates, set fares, and awarded routes, certifying 23 airlines by 1940 and facilitating post-World War II expansion with over 5,000 civil aircraft registered by 1945. Reorganized amid Cold War demands into the Federal Aviation Agency (precursor to the FAA) via the Federal Aviation Act of 1958 after high-profile mid-air collisions, such as the 1956 Grand Canyon crash killing 128, the CAA's economic functions shifted to the Civil Aeronautics Board until deregulation in 1978. This evolution reflected causal priorities: prioritizing safety data over ideological narratives, with accident rates dropping from 12.6 per 100,000 hours in 1938 to under 1 by the 1950s due to empirical engineering mandates. Other notable CAAs include Canada's Transport Canada Civil Aviation (overseeing 1,800 airports and 300,000 annual flights as of 2022) and Iran's Civil Aviation Organization, which manages 54 airports and enforces sanctions-impacted maintenance protocols. These bodies collectively enforce ICAO's 19 annexes, with variations in enforcement rigor; for instance, the UK CAA's audit regime has grounded non-compliant operators, contrasting with less stringent implementations elsewhere amid resource constraints. Source credibility in aviation regulation favors primary governmental reports over media interpretations, as the former provide raw data like the UK CAA's annual safety statistics showing a 99.999% dispatch reliability rate.

Science

The Computer Applications and Quantitative Methods in Archaeology International (CAA International) is a scholarly organization founded in 1973 that convenes archaeologists, computer scientists, and quantitative methodologists to advance computational approaches in archaeological research. It organizes an annual international conference featuring peer-reviewed papers on topics such as digital modeling, geospatial analysis, and data management in archaeology, with proceedings often published in academic volumes. The organization's constitution emphasizes fostering interdisciplinary communication and the application of information technology to archaeological inquiry, maintaining a global membership through chapters and affiliated networks. The Committee on Astronomy and Astrophysics (CAA), established by the U.S. National Academies of Sciences, Engineering, and Medicine, serves as an advisory body monitoring implementation of priorities outlined in the Astronomy and Astrophysics Decadal Survey, a congressionally mandated report produced every decade. Comprising experts from academia, government agencies like NASA and NSF, and observatories, the committee assesses progress on strategic recommendations for ground- and space-based telescopes, theoretical modeling, and data archiving, with reports influencing federal funding allocations as of its activities through 2021. Other entities include the Cuyahoga Astronomical Association (CAA), a regional amateur astronomy club formed in 1957 in Ohio, U.S., dedicated to public education, stargazing events, and promotion of astronomical sciences through telescope observations and outreach programs. These organizations collectively represent specialized efforts in computational archaeology and astrophysics, though their scopes vary from international professional networks to advisory committees and local societies.

Sports and entertainment

Creative Artists Agency (CAA), founded in 1975 in Los Angeles, California, operates as a leading talent agency bridging entertainment and sports representation. The agency manages client careers in film, television, music, live touring, and digital content creation, while its sports division, established in 2006, handles athlete negotiations, endorsements, and strategic advising across professional leagues. By 2024, CAA Sports divisions encompassed representation in baseball, basketball, football, hockey, and soccer through its CAA Base unit, which focuses on European and global soccer talents including players, managers, and coaches. In entertainment, CAA's motion picture and television departments represent performers whose projects have driven significant box office and streaming revenue, with expertise in packaging deals that combine talent, directors, and financing. The agency's music and comedy touring arms book global concerts and live events, leveraging data analytics to optimize artist branding and revenue streams. CAA has pioneered integrations like sports-entertainment crossovers, including endorsement deals tying athletes to media properties. In sports, agents negotiate contracts totaling billions annually; for instance, CAA Football advises on-field agreements and off-field ventures such as media rights and venue development. CAA's expansion includes acquisitions like Portas Consulting in May 2025, enhancing its sports consulting in executive search and infrastructure projects, and earlier ventures into investment banking and technology startups to support client diversification. The agency's model emphasizes long-term client equity stakes and brand partnerships, distinguishing it from traditional representation by incorporating venture funding and content production. This approach has positioned CAA at the intersection of talent, brands, and live events, though it faces competition from agencies like WME and UTA in client retention.

Other organizations

Community Action Agencies (CAAs) are a network of over 1,000 local private and public nonprofit organizations in the United States, established under the Economic Opportunity Act of 1964 as part of President Lyndon B. Johnson's War on Poverty initiative. These agencies implement the Community Action Program by providing services such as energy assistance, housing support, nutrition programs, and job training to low-income individuals and families, with federal funding primarily through the Community Services Block Grant. In fiscal year 2022, CAAs served more than 15 million people across the country, focusing on self-sufficiency and community-level poverty reduction. The California Apartment Association (CAA) is the largest statewide trade association representing owners, investors, developers, managers, and suppliers in the rental housing industry, founded in 1935 and headquartered in Sacramento. With over 30,000 members managing more than one million apartment units as of 2023, it advocates for policies on rent control, tenant screening, and housing development through lobbying, legal services, and education programs. The Circular Action Alliance (CAA) is a U.S.-based producer responsibility organization formed in 2022 to administer extended producer responsibility programs for packaging and paper products in participating states. It facilitates collection, sorting, and recycling infrastructure funded by producers, aiming to reduce landfill waste and increase material recovery rates, with initial pilots in states like Colorado and Oregon. The Consumer Affairs Authority (CAA) of Sri Lanka, established by the Consumer Affairs Authority Act No. 9 of 2003, regulates consumer protection, fair trade practices, and price controls for essential goods. Enforced through inspections and penalties, it has handled thousands of complaints annually, addressing issues like misleading advertising and counterfeit products in the domestic market.

Science and technology

Medicine and biology

Cerebral amyloid angiopathy (CAA) is a neuropathological condition defined by the progressive deposition of amyloid beta (Aβ) proteins, primarily the Aβ40 isoform, in the media and adventitia of small- to medium-sized arteries and arterioles in the cerebral cortex, leptomeninges, and cerebellum. This vascular amyloidosis weakens vessel walls, predisposing individuals to lobar intracerebral hemorrhages, cerebral microbleeds, and transient focal neurological episodes, with hemorrhages often occurring in cortical-subcortical regions rather than deep structures. Biologically, Aβ derives from proteolytic cleavage of the amyloid precursor protein (APP) by β- and γ-secretases, with vascular deposition linked to impaired perivascular drainage and altered Aβ clearance mechanisms, distinct from parenchymal plaques in Alzheimer's disease (AD) yet frequently co-occurring. Autopsy studies indicate CAA prevalence rises sharply with age, affecting approximately 5-8% of those over 65 and up to 80-90% over 90, independent of AD pathology in some cases. In biological terms, CAA exemplifies amyloidogenic protein misfolding and aggregation, where Aβ fibrils disrupt endothelial integrity, smooth muscle cell apoptosis, and blood-brain barrier function, fostering inflammation and oxidative stress. Genetic factors, such as the ApoE ε2 and ε4 alleles, modulate risk, with ε2 promoting hemorrhagic phenotypes and ε4 enhancing Aβ production, though sporadic CAA predominates over rare hereditary forms like Dutch-type (APP E693Q mutation). Diagnosis relies on neuroimaging, with gradient-echo or susceptibility-weighted MRI revealing characteristic lobar microbleeds and superficial siderosis; the Boston criteria v2.0 classify cases as definite (postmortem), probable, or possible based on hemorrhage patterns excluding alternative causes like hypertension. Amyloid PET tracers, such as florbetapir, confirm vascular Aβ but lack specificity for CAA versus AD. Therapeutically, management focuses on hemorrhage prevention, including blood pressure control (target systolic <140 mmHg) and avoidance of antithrombotics, as CAA triples hemorrhage risk under anticoagulation. Emerging anti-Aβ monoclonal antibodies (e.g., aducanumab, lecanemab) show promise for AD but exacerbate CAA-related amyloid-related imaging abnormalities (ARIA), with microhemorrhages in up to 20-30% of high-CAA burden patients, underscoring causal links between vascular Aβ clearance and edema/hemorrhage. Prognosis varies, with recurrent hemorrhage mortality reaching 10-15% annually in symptomatic cases, though asymptomatic CAA detected incidentally may progress slowly without intervention. In parasitology, circulating anodic antigen (CAA) serves as a sensitive biomarker for active schistosomiasis, detectable in serum or urine via enzyme-linked immunosorbent assays (ELISA) targeting gut-derived glycoproteins from Schistosoma worms, with detection thresholds as low as 0.3 pg/mL indicating viable infections missed by egg-based diagnostics. This contrasts with cerebral CAA's neurodegenerative focus, highlighting CAA's context-specific biological roles in diagnostics and pathology.

Engineering and computing

In engineering, computer-aided analysis (CAA) denotes the use of computational tools to simulate, analyze, and optimize engineering designs, forming a key subset of computer-aided engineering (CAE). This process involves finite element analysis, computational fluid dynamics, and other numerical methods to predict system behavior under various conditions, enabling engineers to refine prototypes virtually before physical production. For instance, CAA software integrates with CAD models to evaluate structural integrity, thermal performance, and material stresses, reducing development time and costs in industries like aerospace and automotive manufacturing. Computer-assisted assessment (CAA) in computing and engineering education refers to the deployment of software for automated evaluation of student work, including quizzes, simulations, and code submissions. Systems like these employ algorithms for immediate feedback on multiple-choice tests, essay grading via natural language processing, or even practical assessments in programming courses, enhancing scalability for large engineering cohorts. A 1999 national survey in higher education found CAA adoption in engineering programs improved marking efficiency and provided diagnostic data on student misconceptions in technical subjects, though challenges persist in ensuring fairness for complex, open-ended problems. In computer security, Certification Authority Authorization (CAA) is a DNS resource record (RR) type defined in RFC 6844 (updated by RFC 8659) that allows domain owners to specify which certificate authorities (CAs) may issue TLS/SSL certificates for their domains, mitigating unauthorized issuances. Deployed since 2013, CAA records enhance public key infrastructure (PKI) security by enabling granular control, such as whitelisting trusted CAs or blacklisting others; empirical analysis of deployment shows variable adoption, with major domains like google.com utilizing it to restrict issuance risks. Compliance is advisory for CAs under standards like those from the CA/Browser Forum, but non-enforcement has limited its impact on preventing mis-issuances. Component Application Architecture (CAA) underlies the API for Dassault Systèmes' CATIA software, a platform dominant in mechanical and aerospace engineering for 3D modeling and simulation. Written primarily in C++, this architecture facilitates custom component development, automation of design workflows, and integration with PLM systems, supporting over 100,000 engineering users globally as of recent implementations. It enables extensibility for domain-specific applications, such as generative design optimization, though requires specialized training due to its complexity.

Other uses

Linguistics

In linguistics, CAA serves as the ISO 639-3 code for Ch'orti', a Mayan language of the Cholan branch spoken primarily by the Ch'orti' Maya indigenous people in eastern Guatemala (notably Jocotán and Olopa municipalities) and northwestern Honduras. The language descends from the speech of Classic Maya civilization (c. 250–900 CE), making it the extant Mayan variety most closely resembling the hieroglyphic inscriptions of that era, with shared vocabulary and grammatical structures aiding epigraphic decipherment. Ch'orti' is agglutinative, with verb-initial word order (typically VOS or VSO) and a complex system of noun classifiers, aspect-based verb conjugations, and positional roots for motion and stance, typical of Mayan languages. It exhibits tone distinctions in some dialects, a development from stress patterns in proto-Cholan, and employs the Latin alphabet for writing, though traditionally oral. Ethnologue classifies it as endangered (6b on the Expanded Graded Intergenerational Disruption Scale), with speaker numbers declining due to Spanish dominance, urbanization, and limited institutional support; estimates range from approximately 12,000 fluent speakers in the early 2010s to around 55,000 total users as of 2024, including semi-speakers and L2 learners. Revitalization efforts include community-led documentation, bilingual education programs in Guatemala, and linguistic research producing resources like dictionaries and grammars, though intergenerational transmission remains low, with most children acquiring Spanish as L1. Dialectal variation exists between Guatemalan and Honduran varieties, but mutual intelligibility is high; no standardized orthography is universally adopted.

Geography and miscellaneous

The Canadian Arctic Archipelago (CAA) encompasses over 36,000 islands spanning roughly 1.4 million square kilometres in the Arctic Ocean, primarily within the territories of Nunavut and the Northwest Territories in northern Canada. This vast archipelago serves as a critical conduit for sea ice and freshwater export from the Arctic Ocean to the Atlantic via channels like the Parry Channel and Nares Strait, influencing regional ocean circulation and climate dynamics. It features extreme environmental conditions, including perennial sea ice cover in many areas and numerous tidewater glaciers that contribute nutrients to surrounding marine ecosystems amid ongoing climate-driven retreat. In miscellaneous contexts, CAA denotes the Clean Air Act, the primary U.S. federal statute regulating air pollution since its enactment in 1970, with major amendments in 1977 and 1990 establishing national ambient air quality standards for criteria pollutants such as ozone, particulate matter, and sulfur dioxide. The law authorizes the Environmental Protection Agency to set emissions limits for stationary sources like power plants and mobile sources like vehicles, aiming to mitigate health risks from smog, acid rain, and toxic air contaminants through permitting, enforcement, and state implementation plans. Compliance involves geographic designations of attainment and non-attainment areas based on monitored air quality data, with penalties for violations exceeding billions in fines historically.

References

  1. [1]
    CAA: 12 key points to remember - Press Information Bureau
    Dec 19, 2019 · The Citizenship (Amendment) Act, 2019 (CAA) enables migrants/foreigners of six minority communities from three specified countries who have come to India ...
  2. [2]
    The Citizenship (Amendment) Bill, 2019 - PRS India
    It defines an illegal migrant as a foreigner: (i) who enters India without a valid passport or travel documents, or (ii) stays beyond the permitted time.
  3. [3]
    Citizenship Amendment Act (CAA) 2019 - Latest Rules
    Aug 31, 2025 · CAA 2019 seeks to grant citizenship to illegal migrants from Afghanistan, Bangladesh, and Pakistan who are Hindus, Sikhs, Buddhists, Jains, Parsis, and ...Key Features of the CAA Act... · Criticism on CAA Act, 2019Missing: summary | Show results with:summary
  4. [4]
    Citizenship Amendment Act - Supreme Court Observer
    The CAA makes illegal migrants eligible for citizenship if they (a) belong to the Hindu, Sikh, Buddhist, Jain, Parsi or Christian community and (b) are from ...
  5. [5]
    Evolution of the Clean Air Act | US EPA
    This page describes how the Clean Air Act and its subsequent amendments in 1977 and 1990 evolved from the Air Pollution Control Act on 1955.Introduction · Clean Air Act of 1970 · Clean Air Act Amendments of...
  6. [6]
    Clean Air Act: A Summary of the Act and Its Major Requirements
    Sep 13, 2022 · This report describes the act's major provisions and provides tables listing all major amendments, with the year of enactment and Public Law ...Overview · Transported Air Pollution · Hazardous Air Pollutants
  7. [7]
    Summary of the Clean Air Act | US EPA
    Jul 25, 2025 · The Act was amended in 1977 and 1990 primarily to set new goals (dates) for achieving attainment of NAAQS since many areas of the country had ...Clean Air Act (CAA) · Air Enforcement · EPA History · Overview
  8. [8]
    Accomplishments and Successes of Reducing Air Pollution ... - EPA
    May 7, 2025 · The U.S. vehicle pollution control under the Clean Air Act is a major success story by many measures: New passenger vehicles are 98-99% cleaner ...
  9. [9]
    The Clean Air Act 101 - NRDC
    Aug 11, 2025 · Through the 1990 amendments, the EPA adopted new cost-effective approaches to reducing air pollution. The amendments contained provisions to ...
  10. [10]
    Benefits and Costs of the Clean Air Act 1990-2020, the Second ...
    May 15, 2025 · In March 2011, EPA issued the Second Prospective Report which looked at the results of the Clean Air Act from 1990 to 2020.
  11. [11]
    The impact of the Clean Air Act - PMC - NIH
    The Clean Air Act, signed into law in1970 and strengthened in 1990, gave the federal government the authority to enforce regulations that limit air pollution.
  12. [12]
    [PDF] What Do Economists Have to Say about the Clean Air Act 50 Years ...
    In the case of economic costs, we focus both on positive and normative findings— attempting to take stock of what we know about the effects of the Clean Air Act ...
  13. [13]
    The Clean Air Act and the Economy | US EPA
    Economic welfare and economic growth rates are improved because cleaner air means fewer air-pollution-related illnesses, which in turn means less money spent on ...
  14. [14]
    Clean identification? The effects of the Clean Air Act on air pollution ...
    The effects of the regulation are higher in more polluted areas within regulated regions, with a 0.1µg/m-3 improvement at the 10th percentile of baseline ...
  15. [15]
    The benefits of Clean Air Act regulations need to be measured ...
    May 22, 2022 · Most empirical research finds that, while air quality is improving across the US (Shapiro 2021), it improves more rapidly in non-attainment ...
  16. [16]
    History of Creative Artists Agency LLC – FundingUniverse
    Michael Ovitz, Ron Meyer, Bill Haber, Rowland Perkins, and Michael Rosenfeld found Creative Artists Agency, Inc. (CAA). 1989: CAA commissions and erects a ...
  17. [17]
    Creative Artists Agency (CAA) - InfluenceWatch
    Creative Artists Agency LLC was formed in 1975 by Michael Ovitz, Michael S. Rosenfeld, Ronald Meyer, Rowland Perkins, and William Haber. Established in Delaware ...
  18. [18]
    Inside <i> the </i> Agency : How Hollywood works: Creative Artists ...
    Jul 2, 1989 · Founded 14 years ago by a group of dropouts from the 90-year-old William Morris Agency, CAA has become one of the most powerful, and least understood, show ...
  19. [19]
    About Us | CAA - Creative Artists Agency
    Since our founding in 1975, CAA has continued to deliver on its promise that every client is represented by the whole agency. This collaborative approach ...
  20. [20]
    Motion Pictures | CAA
    CAA represents the writers, directors, and producers of the world's biggest hits and critical successes that define the pop culture landscape.
  21. [21]
    Creative Artists Deal for ICM Is Set to Reshape Hollywood's Talent ...
    Sep 27, 2021 · CAA's client roster includes Tom Hanks, Steven Spielberg, Zendaya, Ava DuVernay, Ryan Murphy and Reese Witherspoon, while Shonda Rhimes, Ellen ...Missing: notable | Show results with:notable
  22. [22]
    Touring artists | CAA - Creative Artists Agency
    Browse our artists. Roster. all. Search for an artist.Missing: notable | Show results with:notable
  23. [23]
    Sharing Inspiration: Creative Artists Agency's Thao Nguyen on ...
    Dec 14, 2022 · Thao Nguyen is an art & design thinking agent at CAA and represents many of the world's leading cultural innovators.
  24. [24]
    How Creative Artists Agency (CAA) Is Employing Data, Analytics ...
    Dec 7, 2022 · In doing so, CAA is empowering the artists, athletes, and brands it represents to shape the culture of our times and inspire the world.
  25. [25]
    Francois-Henri Pinault nears $7B deal for Hollywood talent ... - Fortune
    Aug 31, 2023 · French billionaire Francois-Henri Pinault is close to a $7 billion deal to buy a majority stake in Creative Artists Agency, the Hollywood ...
  26. [26]
    About CAA
    The Canadian Automobile Association (CAA) is one of the largest and oldest consumer-based organizations in Canada.
  27. [27]
    About Us | CAA North & East Ontario
    CAA is now a national lifestyle brand offering exclusive benefits, trusted roadside service, and advocating for consumers, especially in road safety.<|separator|>
  28. [28]
  29. [29]
    CAA Auto Service - Towing, Car Battery, Tire Change & Krown Rust
    CAA provides excellent auto services and car mainteance, such as roadside assistance, car battery change, krown rust protection & auto repair. Learn more.Missing: organization | Show results with:organization
  30. [30]
    Celebrating 50 Years of CAA Insurance
    Jun 12, 2024 · CAA Insurance is celebrating 50 years, started in 1974, expanded to seven provinces, and was named Canada's best auto insurer by Forbes.
  31. [31]
    CAA Insurance Company: Home
    CAA Auto and Property Insurance and CAA Tire Coverage are underwritten by CAA Insurance Company. The CAA Head Start Discount is available to the children or ...Auto Insurance · About Us · CAA Connect · CAA MyPaceMissing: organization | Show results with:organization
  32. [32]
    CAA National | Serving Canadian travellers
    CAA is a not-for-profit federation providing more than 7 million Members with emergency roadside service, Member Reward savings, and comprehensive insurance.Contact Us · Services · About CAA · Join CAA
  33. [33]
    CAA South Central Ontario: Home
    Since 1903, we've worked on being a force of good in all the communities we serve. CAA provides a range of services including roadside assistance, insurance ...Auto · Contact Us · Membership · Travel
  34. [34]
    UK Civil Aviation Authority (UK CAA) | SKYbrary Aviation Safety
    The UK Civil Aviation Authority is a public corporation established by the UK Parliament in 1972 as an independent specialist aviation regulator.<|control11|><|separator|>
  35. [35]
    UK Civil Aviation Authority
    The UK Civil Aviation Authority (CAA), the UK's independent aviation regulator, protects people and enables aviation. Provides guidance and services for ...Contact us · Publications · Passengers and public · General aviation
  36. [36]
    Civil Aviation Authority - GOV.UK
    The Civil Aviation Authority (CAA) is responsible for the regulation of aviation safety in the UK, determining policy for the use of airspace.
  37. [37]
    From Civil Aeronautics Authority (CAA) to FAA
    Nov 16, 2021 · In 1938, oversight of civil aviation passed to a new independent agency, the Civil Aeronautics Authority.
  38. [38]
    Civil Aviation Organization
    To view the electronic services of the Civil Aviation Organization, click on the topic you want. Rules and regulations system. Passenger Rights System ...Roles & Responsibilities · History · Values · Mission<|separator|>
  39. [39]
    CAA International
    CAA is an international organisation bringing together archaeologists, mathematicians and computer scientists. Its aims are to encourage communication between ...
  40. [40]
    Scientific Committee - CAA International
    CAA's Scientific Committee (ScC) is responsible for overseeing the peer-review process for the annual conference to ensure consistency in the scientific ...
  41. [41]
    Constitution - CAA International
    The full title of the organisation shall be “Computer Applications and Quantitative Methods in Archaeology.” This may be abbreviated to “CAA”.Missing: acronym | Show results with:acronym
  42. [42]
    Committee on Astronomy and Astrophysics | National Academies
    The Committee on Astronomy and Astrophysics (CAA) is tasked with monitoring the progress of the recommended priorities of the astronomy and astrophysics ...
  43. [43]
    [PDF] NSF AST Update for CAA Nov 8, 2021 Presentation to CAA Debra ...
    ... organization, for five ... NSF's National Optical-Infrared Astronomy Research Laboratory NOIRLab. Nov 8, 2021 Presentation to CAA ... Acronym. Program Name.<|separator|>
  44. [44]
    CAA: Cuyahoga Astronomical Association | Practicing the Hobby ...
    The Cuyahoga Astronomical Association (CAA) was established in 1957. Our purpose is to organize local amateur astronomers and to promote the science of ...
  45. [45]
    How a Hollywood Talent Agency Won Big With Sports
    Jul 28, 2016 · Creative Artists Agency, dominant for decades in the entertainment business, stepped into the sports world in 2006 with the creation of CAA Sports.
  46. [46]
    CAA Base
    Through our CAA Base division, we represent many of the world's leading soccer players, managers, and coaches, and we have a track record of completing ...
  47. [47]
    Football | CAA
    CAA Football to guide their on- and off-field business strategies. With vast experience in negotiating contracts and securing endorsement deals.
  48. [48]
    CAA Sports Acquires Portas Consulting - The Hollywood Reporter
    May 13, 2025 · CAA Sports currently has 18 divisions, including athlete representation, brand consulting, media rights, executive search and venue development.<|separator|>
  49. [49]
    What is Community Action?
    Community Action Agencies (CAA) are private nonprofit or public organizations that were created by the federal government in 1964 to combat poverty.
  50. [50]
    What is a Community Action Agency?
    Community Action Agencies (CAA) are local private and public non-profit organizations that carry out the Community Action Program (CAP).
  51. [51]
    About CAA - CAA of Columbiana County
    Today, the Community Action Agency Network is made up of more than 1,100 local, private, non-profit and public agencies. CAAs provide services to more than 15 ...
  52. [52]
    About CAA - The California Apartment Association
    The California Apartment Association is the nation's largest statewide trade group. CAA represents owners, investors, developers, managers and suppliers.
  53. [53]
    About - Circular Action Alliance
    Circular Action Alliance (CAA) is a U.S. Producer Responsibility Organization (PRO) dedicated to implementing effective Extended Producer Responsibility (EPR) ...Missing: stand | Show results with:stand
  54. [54]
    CAA - Definition by AcronymFinder
    What does CAA stand for? ; CAA, Concepts Analysis Agency (US Army) ; CAA · Christian Conference of Asia (regional ecumenical organization) ; CAA, Canadian Authors ...
  55. [55]
    Cerebral Amyloid Angiopathy - StatPearls - NCBI Bookshelf - NIH
    Jun 5, 2023 · Cerebral amyloid angiopathy (CAA) is a type of cerebrovascular disorder characterized by the accumulation of amyloid within the leptomeninges ...Missing: biology | Show results with:biology
  56. [56]
    Cerebral Amyloid Angiopathy: What It Is, Symptoms & Treatment
    Cerebral Amyloid Angiopathy. Cerebral amyloid angiopathy (CAA) happens when amyloid (abnormal) proteins build up in blood vessels in your brain.Missing: biology | Show results with:biology
  57. [57]
    Cerebral amyloid angiopathy - UpToDate
    Aug 14, 2025 · INTRODUCTION. Cerebral amyloid angiopathy (CAA) is characterized by amyloid beta-peptide deposits within small- to medium-sized blood ...
  58. [58]
    Cerebral amyloid angiopathy: MedlinePlus Medical Encyclopedia
    Jun 13, 2024 · Cerebral amyloid angiopathy (CAA) is a condition in which proteins called amyloid build up on the walls of the arteries in the brain.Missing: biology | Show results with:biology
  59. [59]
    Exploring cerebral amyloid angiopathy: Insights into pathogenesis ...
    Nov 15, 2023 · CAA is a progressive neurological condition with amyloid deposits in brain blood vessel walls. •. CAA is a major cause of cerebral ...
  60. [60]
    Cerebral amyloid angiopathy | Radiology Reference Article
    Sep 18, 2025 · Cerebral amyloid angiopathy (CAA) is a cerebrovascular disorder caused by the accumulation of cerebral amyloid-β (Aβ) in the tunica media and adventitia of ...Inflammatory cerebral amyloid... · Illustration · Boston criteria 2.0 · Question 2694<|separator|>
  61. [61]
    Inflammatory Cerebral Amyloid Angiopathy, Amyloid-β–Related ...
    Jul 16, 2015 · Cerebral amyloid angiopathy (CAA) results from deposition of amyloid-β fibrils in the wall of the small and medium-sized blood vessels.
  62. [62]
    Circulating Anodic Antigen (CAA): A Highly Sensitive Diagnostic ...
    Circulating Anodic Antigen (CAA): A Highly Sensitive Diagnostic Biomarker to Detect Active Schistosoma Infections—Improvement and Use during SCORE · INTRODUCTION.<|control11|><|separator|>
  63. [63]
    Computer-Aided Analysis | SpringerLink
    Computer-aided analysis (CAA) is the name given to the analysis and optimising parts of the design process which, together with computer- aided design and ...
  64. [64]
  65. [65]
    Computer-assisted Assessment (CAA) - Advance HE
    Computer-assisted Assessment (CAA). The purpose of this guide is to explore the role which computers can play in the assessment process. The briefing ...
  66. [66]
    CAA - Glossary | CSRC - NIST Computer Security Resource Center
    Definitions: A record associated with a Domain Name Server (DNS) entry that specifies the CAs that are authorized to issue certificates for that domain.
  67. [67]
    Skills: CATIA CAA - Why isicad?
    The API (application programming interface) for CATIA is called «CAA» – an acronym for Component Application Architecture. This API is written in C++. CATIA has ...
  68. [68]
    Ch'orti' Language (CAA) - Ethnologue
    Ch'orti' is an endangered indigenous language of Guatemala and Honduras. It belongs to the Mayan language family. The language is used as a first language ...
  69. [69]
    Ch'orti' - Glottolog 5.2
    Spoken L1 Language: Ch'orti'. Classification. open Ch'orti'; expand all ... ISO 639-3 [caa] at ISO 639-3 · OLAC [caa] at OLAC · IMTVault [caa] at IMTVault ...
  70. [70]
    A Dictionary of Ch'orti' Mayan-Spanish-English - Project MUSE
    Nov 19, 2016 · Of extant languages, Ch'orti' Mayan is the closest to ancient the Maya hieroglyphic script, but it is a language that is decreasing in usage.Missing: CAA | Show results with:CAA
  71. [71]
    Chorti language and alphabet - Omniglot
    Apr 5, 2024 · Chorti is a Mayan language spoken in parts of Guatemala, Honduras and El Salvador by about 55,000 people. Chorti is also known as Ch'orti' Maya.
  72. [72]
    [PDF] The Ch'orti' Maya Myths of Creation - Oral Tradition Journal
    Ch'orti' today is spoken by roughly 12,000 people, though the number of speakers has been in decline over the last century. Bilingualism in Spanish is pervasive ...<|separator|>
  73. [73]
    Reconnecting with Ch'orti' - MSU Denver RED
    Dec 11, 2019 · ... Ch'orti'. Here's how Metropolitan State University of Denver's Ch'orti' Project is saving a living descendant of the classical Mayan language.
  74. [74]
    Sea ice transport and replenishment across and within the ... - TC
    May 7, 2024 · The Canadian Arctic Archipelago (CAA) serves as both a source and a sink for sea ice from the Arctic Ocean, while also exporting sea ice into Baffin Bay.
  75. [75]
    Role of sea level pressure in variations of the Canadian Arctic ...
    The throughflow in the Canadian Arctic Archipelago (CAA) had a significant impact on the North Atlantic Ocean with the Arctic climate change.
  76. [76]
    Glaciers and Nutrients in the Canadian Arctic Archipelago Marine ...
    Jul 16, 2021 · The Canadian Arctic Archipelago (CAA) is vulnerable to climate warming, and with over 300 tidewater glaciers, is a hotspot for enhanced ...
  77. [77]
    Clean Air Act (CAA) and Federal Facilities | US EPA
    May 6, 2025 · The Clean Air Act (CAA) is the federal law enacted to nationally control air pollution and emissions from stationary and mobile sources.
  78. [78]
    Clean Air Act (CAA)
    Air quality attainment and non-attainment areas are used to describe whether a specific geographic area meets or fails to meet the air quality standards set by ...