- Criteria air pollutants that are regulated under National Ambient Air Quality Standards (NAAQS). These pollutants include carbon monoxide, lead, nitrogen dioxide, ground-level ozone, particulate matter (PM), and sulfur dioxide.
- Pollutants regulated under New Source Performance Standards (NSPS) including dioxins/furan, fluorides, hydrogen chloride, hydrogen sulfide, sulfuric acid mist, total reduced sulfur, reduced sulfur compounds, and total suspended particles.
- Pollutants regulated under stratospheric ozone protection rules, including chlorofluorocarbons (CFCs) and other ozone depleting substances.
- Acid rain pollutants, including sulfur dioxide and nitrogen oxides.
- Hazardous air pollutants (HAPs) regulated under National Emission Standards for Hazardous Air Pollutants (NESHAPs).
- Greenhouse gases, including carbon dioxide, methane, nitrous oxide and fluorinated or chlorinated gasses.
- Precursor pollutants, which are substances that react chemically to form other pollutants and include nitrogen oxides and volatile organic compounds that form ground-level ozone, sulfur dioxide and nitrogen oxides that form fine particulate matter (PM2.5), and HAPs that are constituents or precursors of general pollutants that produce adverse effects on public health or welfare.
The same pollutant may be regulated under more than one standard. For example, lead is regulated as a criteria pollutant and a HAP.
New Source Review Pollutants
New source review pollutants include pollutants regulated under a NAAQS and their precursors; pollutants regulated under a NSPS; stratospheric ozone pollutants; greenhouse gasses; and HAPs that are regulated as a constituent or precursor of a general pollutant that could cause adverse impacts to public health.