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National Ambient Air Quality Standards |
Primary Standards |
Secondary Standards |
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| Pollutant | Level | Averaging Time | Level | Averaging Time |
|---|---|---|---|---|
| Carbon Monoxide | 9 ppm (10 mg/m3) | 8-hour | None |
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| 35 ppm (40mg/m3) | 1-hour | |||
| Lead | 1.5 µg/m3 | Quarterly Average | Same as Primary |
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| Nitrogen Dioxide | 0.053 ppm (100 µg/m3) | Annual (Arithmetic Mean) | Same as Primary |
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| Particulate Matter (PM10) | 150 µg/m3 | 24-hour | Same as Primary |
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| Particulate Matter (PM2.5) | 15.0 µg/m3 | Annual (Arithmetic Mean) | Same as Primary |
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| 35 µg/m3 | 24-hour | Same as Primary |
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| Ozone | 0.075 ppm (2008 std) | 8-hour | Same as Primary |
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| 0.08 ppm (1997 std) | 8-hour | Same as Primary |
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| 0.12 ppm | 1-hour (Only in limited areas) | Same as Primary |
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| Sulfur Dioxide | 0.03 ppm | Annual (Arithmetic Mean) | 0.5 ppm (1300 µg/m3) | 3-hour |
| 0.14 ppm | 24-hour | |||
