Ambient Standards
Ambient Air Quality Standards |
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| Pollutant | Standard | Unit | Comments |
| Particulate Matter | |||
| PM10 - 24 hour | 150 | ug/m3 | Primary and Secondary Standard: Maximum 24 – hour average concentration with not more than one expected exceedance per year. |
| PM2.5 - 24 hour | 35 | ug/m3 | Primary and Secondary Standard: based upon the annual 98th percentile averaged over a three year period. |
| PM2.5 - Annual | 15 | ug/m3 | Primary and Secondary Standard: Maximum expected annual arithmetic mean averaged over three years. |
| Sulfur Dioxide | |||
| Annual | 0.030 | ppm | Secondary Standard: 0.5 ppm, 3- hour averaging time, not to be exceeded more than once per year. |
| 24 hour | 0.14 | ppm | |
| 1 hour | 75 | ppb | Primary Standard: based upon the annual 99th percentile averaged over a three year period. |
| Carbon Monoxide | |||
| 8 hour | 9.0 | ppm | Primary Standard: (10 milligrams per cubic meter of air), maximum 8-hour average concentration not to be exceeded more than once per year. |
| 1 hour | 35.0 | ppm | Primary Standard: (40 milligrams per cubic meter of air), maximum 1-hour average concentration not to be exceeded more than once per year. |
| Ozone | |||
| 8 hour (2008 std) |
0.075 |
ppm | Primary and Secondary Standard: Fourth highest maximum 8-hour average concentration averaged over a three year period. |
| 8 hour (1997 std) |
0.080 |
ppm | Primary and Secondary Standard: Fourth highest maximum 8-hour average concentration averaged over a three year period. |
| Nitrogen Dioxide | |||
| Annual | 53 |
ppb | Primary and Secondary Standard: maximum annual arithmetic mean concentration. |
| 1 hour | 100 | ppb | Primary Standard: based upon the annual 98th percentile averaged over a three year period. |
| Lead | |||
| Rolling 3 month average | 1.5 |
ug/m3 | Primary and Secondary Standard: annual maximum rolling 3 month average averaged over a three year period. |
