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  • Criteria Air Pollutants | US EPA
    The Clean Air Act requires EPA to set National Ambient Air Quality Standards (NAAQS) for six commonly found air pollutants known as criteria air pollutants Together with state, tribal and local air agencies we work to attain the standards throughout the country
  • NAAQS Table | US EPA
    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
  • Criteria Air Pollutants - U. S. Environmental Protection Agency
    EPA has established national ambient air quality standards (NAAQS) for six of the most common air pollutants— carbon monoxide, lead, ground-level ozone, particulate matter, nitrogen dioxide, and sulfur dioxide—known as “criteria” air pollutants (or simply “criteria pollutants”)
  • Managing Air Quality - Air Pollutant Types | US EPA
    These pollutants (known as "criteria pollutants") are found all over the United States They are particulate matter (often referred to as particle pollution), ground-level ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead
  • Air Quality | Air Quality Planning Standards | US EPA
    The EPA has these pollutants classified as the six principal pollutants (or "criteria pollutants" - as they are also known) These pollutants are monitored by the EPA, as well as national, state and local organizations
  • Regulatory and Guidance Information by Topic: Air | US EPA
    Six Criteria Air Pollutants: Carbon Monoxide, Ground-level Ozone, Lead, Nitrogen Oxides, Particulate Matter, and Sulfur Dioxide The Clean Air Act (CAA) requires EPA to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants
  • Definition of Regulated Air Pollutant for Purposes of Title V
    Once a source is subject to a title V its emissions of all regulated air pollutants meet the permitting authority's criteria for all emissions of pollutants for which the major
  • Environments and Contaminants - Criteria Air Pollutants
    The six most common air pollutants are called “criteria” air pollutants and include carbon monoxide (CO), lead (Pb), ground-level ozone (O3), particulate matter (PM), nitrogen dioxide (NO2), and sulfur dioxide (SO2)
  • Information by Pollutant | US EPA
    Information by Pollutant Select one of the options below to learn more about setting and implementing the National Ambient Air Quality Standards Ground-Level Ozone Particle Pollution Nitrogen Dioxide Sulfur Dioxide Carbon Monoxide Lead
  • Air Emissions Sources | Air Emissions Inventories | US EPA
    EPA has set national air quality standards for six common air pollutants (also called the criteria pollutants): nitrogen dioxide (NO2), ozone (O3), sulfur dioxide (SO2), particulate matter (PM), carbon monoxide (CO), and lead (Pb) Four of these pollutants (CO, Pb, NO2, and SO2) are emitted directly from a variety of sources





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