View state and federal standards for 11 air pollutants and see the Bay Area’s attainment status for each pollutant.
Federal and state ambient air quality standards have been set to protect public health and the climate. “Attainment” status for a pollutant means that the Air District meets the standard set by the U.S. Environmental Protection Agency (federal) or California Environmental Protection Agency (state). Continuous air monitoring ensures that these standards are met and maintained.
Pollutant | Averaging Time |
California Standards1 | National Standards2 | ||
---|---|---|---|---|---|
Concentration | Attainment Status | Concentration3 | Attainment Status | ||
Ozone | 8 Hour | 0.070 ppm (137µg/m3) |
N9 | 0.070 ppm Primary same as secondary |
N4 |
1 Hour | 0.09 ppm (180 µg/m3) |
N | See Note #5 | ||
Carbon Monoxide | 8 Hour |
9.0 ppm (10 mg/m3) |
A |
9 ppm (10 mg/m3) |
A6 |
1 Hour | 20 ppm (23 mg/m3) |
A | 35 ppm (40 mg/m3) |
A | |
Nitrogen Dioxide | 1 Hour |
0.18 ppm (339 µg/m3) |
A |
0.100 ppm See Note #11 |
See Footnote #11 |
Annual Arithmetic Mean |
0.030 ppm (57 µg/m3) |
0.053 ppm (100 µg/m3) |
A | ||
Sulfur Dioxide See Note #12 |
24 Hour |
0.04 ppm (105 µg/m3) |
A |
0.14 ppm
(365 µg/m3) |
See Footnote #12 |
1 Hour |
0.25 ppm (655 µg/m3) |
A |
0.075 ppm (196 µg/m3) |
See Footnote #12 | |
Annual Arithmetic Mean | 0.030 ppm (80 µg/m3) |
See Footnote #12 | |||
Particulate Matter (PM10) | Annual Arithmetic Mean |
20 µg/m3 | N7 | ||
24 Hour | 50 µg/m3 | N | 150 µg/m3 | U | |
Particulate Matter - Fine (PM2.5) | Annual Arithmetic Mean |
12 µg/m3 |
N7 |
12 µg/m3 See Note #15 |
U/A |
24 Hour | 35 µg/m3 See Note #10 |
N | |||
Sulfates |
24 Hour |
25 µg/m3 |
A |
||
Lead
See Note #13 |
30 day Average |
1.5 µg/m3 | - |
A |
|
Calendar Quarter | - | 1.5 µg/m3 | A | ||
Rolling 3 Month Average14 |
- | 0.15 µg/m3 | See Note #14 |
||
Hydrogen Sulfide |
1 Hour |
0.03 ppm (42 µg/m3 |
U |
||
Vinyl Chloride (chloroethene) |
24 Hour |
0.010 ppm (26 µg/m3 |
No information available |
||
Visibility Reducing particles |
8 Hour (10:00 to 18:00 PST) |
See Note #8 | U |
||
A=Attainment N=Nonattainment U=Unclassified | |||||
mg/m3=milligrams per cubic meter | ppm=parts per million | µg/m3=micrograms per cubic meter |
Last Updated: 1/5/2017