MIL-HDBK-1003/7
Table 30
Primary and Secondary Ambient Air Quality Standards
(micrograms/m3 except where otherwise noted)
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Secondary Standard *
*
Primary Standard
*
*
* Sulfur Dioxide
*
*
* 3-hour concentration (a)
--
1,300
* 24-hour concentration (a)
*
365
--
*
* Annual concentration
80
--
* Particulate Matter PM10 (c)
*
* 24-hour concentration (a)
*
150
150
* Annual concentration
*
50
50
* Carbon Monoxide
*
*
* 1-hour concentration (a)
40 mg/m3
40 mg/m3
* 8-hour concentration (a)
*
3
3
10 mg/m
10 mg/m
* Ozone
*
*
* 1-hour concentration (b)
235
235
* Nitrogen Dioxide
*
* Annual concentration
*
100
100
* Lead
*
* Calendar quarter
*
1.5
1.5
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(a) Not to be exceeded more than once per year.
(b) Not to be exceeded more than an average of one day per year over 3 years. (c)
Since 1987, the standard has been based on particulate matter with an aerodynamic
diameter of 10 microns and less (PM10). Prior to that date, the standard was based on
total suspended particulate (TSP).
Even if the area is currently nonattainment, a new facility may be
permitted. But to receive a permit, other sources of pollution must be reduced. These
"offsets" are part of the permitting process. The amount of offsets available can
affect the amount of stack emissions permitted from a new source.
Each state has also established ambient air quality standards. Most states
have adopted the NAAQS. A few have more restrictive standards. The most restrictive
standards will apply.
Prevention of Significant Deterioration Limits. Originally under the Clean
18.1.2
Air Act (CAA), new air pollution sources could be added until the ambient air quality
became as bad as the NAAQS. Now the CAA includes limits to the amount of new pollution
in clean air areas. These increment limits currently exist for only SO2, NOx, and
particulate matter. The maximum permitted increases are as follows:
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