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The following table lists APEN and permit threshold limits for pollutants in Colorado. VOCs and NOx are considered precursors to ozone and therefore businesses in the 8-hour ozone nonattainment area must report at the nonattainment thresholds for those pollutants. All other pollutants are reported at the attainment thresholds. The 8-hour ozone nonattainment area currently consists of the following counties:
- Adams
- Arapahoe
- Boulder (including most of Rocky Mountain National Park)
- Broomfield
- Denver
- Douglas
- Jefferson
- and a portion of Larimer and Weld (see ozone nonattainment map).
Ozone nonattainment map
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APEN AND PERMIT REPORTING THRESHOLDS FOR ATTAINMENT AND NONATTAINMENT AREAS |
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|
APEN |
Permit | |||
|
Pollutant Category |
Attainment (tons per year) |
Nonattainment (tons per year) |
Attainment (tons per year) |
Nonattainment (tons per year) |
|
Volatile organic compounds (VOCs) |
2 |
1 |
5 |
2 |
|
PM-10 and PM-2.5 |
2 |
1 |
5 |
1 |
|
Total suspended particulates (TSP) |
2 |
1 |
10 |
5 |
|
Carbon monoxide (CO) |
2 |
1 |
10 |
5 |
|
Sulfur dioxide (SOx) |
2 |
1 |
10 |
5 |
|
Nitrogen oxides (NOx) |
2 |
1 |
10 |
5 |
|
Lead |
100 pounds per year |
100 pounds per year |
200 pounds per year |
200 pounds per year |
|
Other criteria pollutants1 |
2 |
1 |
2 |
2 |
|
Hazardous Air Pollutants (HAPs) |
250 pounds per year | 250 pounds per year | _ | _ |
1-Other criteria pollutants (fluorides, sulfuric acid mist, hydrogen sulfide, total reduced sulfur, reduced sulfur compounds, and municipal waste combustor emissions).