AIR POLLUTANTS 200 Air pollutants are recognized and

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AIR POLLUTANTS 200 Air pollutants are recognized and assessed by the USEPA Listed in

AIR POLLUTANTS 200 Air pollutants are recognized and assessed by the USEPA Listed in the Clean Air Act

CRITERIA POLLUTANTS Six most common air pollutants Responsible for most of air pollution problems

CRITERIA POLLUTANTS Six most common air pollutants Responsible for most of air pollution problems Ozone Sulfur Dioxide Nitrogen Oxides Carbon Monoxide Lead Particulate Matter (Other problematic air pollutants are called: air toxics

CLASSIFICATION OF AIR POLLUTANTS Primary Pollutants emitted directly into air ex. - particulates, sulfur

CLASSIFICATION OF AIR POLLUTANTS Primary Pollutants emitted directly into air ex. - particulates, sulfur dioxide, carbon monoxide, nitrogen oxides Secondary Pollutants reaction between primary pollutant and normal atmospheric compounds ex. - ozone

AIR POLLUTION OF NATURAL ORIGIN Sulfur Dioxide Hydrogen Sulfide Springs Ozone Particulates Windstorms Volcanic

AIR POLLUTION OF NATURAL ORIGIN Sulfur Dioxide Hydrogen Sulfide Springs Ozone Particulates Windstorms Volcanic eruptions Geysers & Hot Lightning Wildfires &

CLEAN AIR ACT Protects the public from airborne contaminants 1963 – 1967 Established for

CLEAN AIR ACT Protects the public from airborne contaminants 1963 – 1967 Established for research into the hazards of airborne contaminants 1970 – 1977 Federal and State regulations established on stationary pollution sources (industrial) and sources (cars) mobile 1990 Addressed Acid Rain, toxic emissions, ozone depletion and automobile exhaust. (emissions tests)

AIR QUALITY STANDARDS Pollutant [final rule cite] Carbon Monoxide [76 FR 54294, Aug 31,

AIR QUALITY STANDARDS Pollutant [final rule cite] Carbon Monoxide [76 FR 54294, Aug 31, 2011] Lead [73 FR 66964, Nov 12, 2008] Nitrogen Dioxide [75 FR 6474, Feb 9, 2010] [61 FR 52852, Oct 8, 1996] primary and secondary Ozone [73 FR 16436, Mar 27, 2008] Particle Pollution Dec 14, 2012 Sulfur Dioxide [75 FR 35520, Jun 22, 2010] [38 FR 25678, Sept 14, 1973] Primary/ Averaging Time Secondary 8 -hour primary 1 -hour primary Rolling 3 month and average secondary primary 1 -hour 98 th percen tile, averaged over 3 years Annu 53 ppb (2) al primary and secondary primary secondary PM 2. 5 primary and secondary primary PM 10 and secondary primary Level Form 9 ppm 35 ppm Not to be exceeded more than once per year 0. 15 μg/m 3 (1) Not to be exceeded 100 ppb Annual Mean 8 -hour 0. 075 ppm (3) Annual fourth-highest daily maximum 8 -hr concentration, averaged over 3 years Annual 12 μg/m 3 15 μg/m 3 annual mean, averaged over 3 years 24 -hour 35 μg/m 3 98 th percentile, averaged over 3 years 24 -hour 150 μg/m 3 Not to be exceeded more than once per year on average over 3 years 1 -hour 75 ppb (4) secondary 3 -hour 0. 5 ppm 99 th percentile of 1 -hour daily maximum concentrations, averaged over 3 years Not to be exceeded more than once per year

DISTRIBUTION Pollutants DO NOT uniformly distribute in the atmosphere. They remain concentrated locally or

DISTRIBUTION Pollutants DO NOT uniformly distribute in the atmosphere. They remain concentrated locally or regionally from their source