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DFE World: Design & the Global Environment
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 Air Pollution

National Ambient Air Quality Standards

POLLUTANT

STANDARD
VALUE *

STANDARD
TYPE

Carbon Monoxide (CO)

    8-hour Average

9 ppm

(10 mg/m3)

Primary

    1-hour Average

35 ppm

(40 mg/m3)

Primary


Nitrogen Dioxide (NO2)

    Annual Arithmetic Mean

0.053 ppm

(100 µg/m3)

Primary & Secondary


Ozone (O3)

    1-hour Average

0.12 ppm

(235 µg/m3)

Primary & Secondary

    8-hour Average **

0.08 ppm

(157 µg/m3)

Primary & Secondary


Lead (Pb)

    Quarterly Average

1.5 µg/m3

 

Primary & Secondary


Particulate (PM 10)       Particles with diameters of 10 micrometers or less

    Annual Arithmetic Mean

50 µg/m3

 

Primary & Secondary

    24-hour Average

150 µg/m3

 

Primary & Secondary


Particulate (PM 2.5)       Particles with diameters of 2.5 micrometers or less

    Annual Arithmetic Mean **

15 µg/m3

 

Primary & Secondary

    24-hour Average **

65 µg/m3

 

Primary & Secondary


Sulfur Dioxide (SO2)

    Annual Arithmetic Mean

0.03 ppm

(80 µg/m3)

Primary

    24-hour Average

0.14 ppm

(365 µg/m3)

Primary

    3-hour Average

0.50 ppm

(1300 µg/m3)

Secondary