Sulfur Dioxide (SO2) -
24 Hour Standard
National Ambient Air Quality Standard – 0.14 parts per million (ppm) - Not to be exceeded
more than once a year.
Sulfur dioxide (SO2), a colorless, reactive gas, is produced when sulfur-containing fuels such as coal and oil are burned. Major sources include power plants and industrial boilers. Generally, the highest levels of sulfur dioxide are near large industrial complexes.
Air Quality Index (AQI): Sulfur Dioxide (SO2)
Index Values |
Levels of Health Concern |
Cautionary Statements |
0-50 |
Good |
None |
51-100* |
Moderate |
None |
101-150 |
Unhealthy for
Sensitive Groups |
People with asthma should consider reducing exertion outdoors. |
151-200 |
Unhealthy |
Children, asthmatics, and people with heart or lung disease should reduce exertion outdoors. |
201-300 |
Very Unhealthy |
Children, asthmatics, and people with heart or lung disease should avoid outdoor exertion. Everyone else should reduce exertion outdoors. |
301-500 |
Hazardous |
Children, asthmatics, and people with heart or lung disease should remain indoors. Everyone else should avoid exertion outdoors. |
* An AQI of 100 for sulfur dioxide corresponds to an SO2 level of
0.14 parts per million (averaged over 24 hours). |
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