The Federal Clean Air Act provides for the establishment of National Ambient Air Quality Standards (NAAQS) to protect the public from harmful concentrations of the most common air pollutants.

Standards have been developed for the six major air pollutants, called criteria pollutants: carbon monoxide (CO), sulfur dioxide (SO₂), lead (P_b), ozone (O₃), nitrogen dioxide (NO₂), and airborne particulate matter: particulate matter of 10 micrometers or less (PM10) and particulate matter of 2.5 micrometers or less (PM_2.5). airborne .

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