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National Ambient Air Quality Standards - Wikipedia
https://en.wikipedia.org/wiki/National_Ambient_Air_Quality_Standards
WebThe NAAQS are health based and the EPA sets two types of standards: primary and secondary. The primary standards are designed to protect the health of 'sensitive' populations such as asthmatics, children, and the elderly. The secondary standards are concerned with protecting the environment.
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Reviewing National Ambient Air Quality Standards (NAAQS): …
https://www.epa.gov/naaqs
WebMar 12, 2024 · The statute established two types of national air quality standards: primary standards. and. secondary standards. This website provides scientific and technical information about the current or prior review of the NAAQS for each of …
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NAAQS Table | US EPA
https://www.epa.gov/criteria-air-pollutants/naaqs-table
WebFeb 7, 2024 · NAAQS Table. The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards (40 CFR part 50) for six principal pollutants ("criteria" air pollutants) which can be harmful to public health and the environment. The Clean Air Act identifies two types of national ambient air quality standards.
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National Ambient Air Quality Standards (NAAQS) for PM
https://www.epa.gov/pm-pollution/national-ambient-air-quality-standards-naaqs-pm
WebMar 6, 2024 · Rule Summary. On February 7, 2024, EPA strengthened the National Ambient Air Quality Standards for Particulate Matter (PM NAAQS) to protect millions of Americans from harmful and costly health impacts, such as heart attacks and premature death.
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Reviewing National Ambient Air Quality Standards (NAAQS)
https://19january2021snapshot.epa.gov/naaqs_.html
WebOct 28, 2020 · EPA sets NAAQS for six principal pollutants, called "criteria" pollutants. Learn the levels of the current standards in a summary table. The Clean Air Act requires EPA to review the standards – and the science behind them – periodically to determine whether changes are warranted.
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National Ambient Air Quality Standards (NAAQS) - US EPA
https://www3.epa.gov/ttn/naaqs/criteria.html
WebCarbon Monoxide Standards; Lead Standards; Nitrogen Dioxide Primary Standards; Nitrogen Dioxide Secondary Standards; Ozone Standards; Particulate Matter Standards; Sulfur Dioxide Primary Standards; Sulfur Dioxide Secondary Standards
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Our Nation's Air 2021 - US EPA
https://gispub.epa.gov/air/trendsreport/2021/
WebThe Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for specific pollutants to safeguard human health and the environment. These standards define the levels of air quality that EPA determines are necessary to protect against the adverse impacts of air pollution based on scientific evidence.
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National Ambient Air Quality Standards (NAAQS) for PM
https://19january2021snapshot.epa.gov/pm-pollution/national-ambient-air-quality-standards-naaqs-pm_.html
WebDec 21, 2020 · Currently, the EPA has primary and secondary standards for PM 2.5 (annual average standards with levels of 12.0 µg/m 3 and 15.0 µg/m 3, respectively; 24-hour standards with 98th percentile forms and levels of 35 µg/m 3) and PM 10 (24-hour standards with one-expected exceedance forms and levels of 150 µg/m 3 ).
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National Ambient Air Quality Standards - Encyclopedia Britannica
https://www.britannica.com/science/National-Ambient-Air-Quality-Standards-United-States
WebNational Ambient Air Quality Standards (NAAQS), in the United States, allowable levels of harmful pollutants set by the Environmental Protection Agency (EPA) in accordance with the Clean Air Act (CAA). The CAA established two types of standards for ambient air quality.
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National Ambient Air Quality Standards
https://ww2.arb.ca.gov/resources/national-ambient-air-quality-standards
WebWhat is an ambient air quality standard? An air quality standard defines the maximum amount of a pollutant averaged over a specified period of time that can be present in outdoor air without harming public health, and thus, it defines clean air.
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