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Ozone, Particulate Matter Data

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For more detailed Air Monitoring Data, see the South Carolina Air Monitoring Network provided by the DHEC Bureau of Air.


Definitions

  • 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.

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