NAAQS¬†- National Ambient Air Quality Standards.¬† These are limits set by the Environmental Protection Agency (EPA) for pollutants that are considered to be hazardous to public health and to the environment.¬† There are six criteria pollutants for which these limits have been established:¬† Particulate Matter with diameter of ten (10) microns (PM10) or 2.5 microns (PM2.5), Carbon Monoxide (CO), Sulfur Dioxide (SO2), Nitrogen Dioxide (NO2), Ozone (O3) and Lead (Pb).
Ozone Standard¬†- The ozone National Ambient Air Quality Standard (NAAQS) is comprised of a primary standard to protect health and a secondary standard to protect sensitive plants and animals. The EPA revised both 8-hour ground level ozone standards to a level of 0.075 parts per million (ppm). To meet the ozone standard, the 3-year average of the fourth-highest daily maximum 8-hour average ozone concentrations measured at each monitor within an area over each year must not exceed 0.075 ppm.
PM2.5¬†Standard¬†- The PM2.5¬†NAAQS is comprised of a primary standard to protect health and a secondary standard to protect public welfare, including protection against visibility impairment, damage to animals, crops, vegetation and buildings. There are two averaging times for the PM2.5¬†NAAQS.¬† The annual standard measures chronic exposures to PM2.5¬†while the 24-hour standard measures acute (or short-term) exposures.¬† The EPA has set both PM2.5¬†standards to a level of 12.0 micrograms per cubic meter (¬Ķg/m3) for the annual averaging time and 35 ¬Ķg/m3 for the 24-hour averaging time. To meet the annual PM2.5standard, the 3-year average of the weighted annual mean PM2.5¬†concentrations from single or multiple community-oriented monitors must not exceed 12.0 ¬Ķg/m3.¬† To meet the 24-hour PM2.5¬†standard, the 3-year average of the 98th percentile of 24-hour concentrations at each population-oriented monitor within an area must not exceed 35 ¬Ķg/m3.
EPA Ozone¬†- This page provides additional information about ground-level ozone.
¬†AirNow¬†- Air Now is a cross-agency U.S. Government web site that provides current and forecasted information about air quality by region ‚Äď specifically related to particulate matter and ozone pollution.
EPA Air Emissions Data¬†- From this US EPA web page you can find information about major source pollution where you live.
For additional information, contact the SC EPHT program: firstname.lastname@example.org
These web pages are supported by Cooperative Agreement Number 5U38EH000628-02 from The Centers for Disease Control and Prevention. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention.