| NATIONAL AMBIENT AIR QUALITY STANDARDS | ||
| POLLUTANT | UPPER LIMIT | AVERAGE TIME |
| OZONE | 120 PPB | 1 HOUR AVERAGE |
| 80 PPB | 8 HOUR AVERAGE | |
| PM 10 (particulate matter less than or equal to 10 microns in diameter) | 150 mg/m3 | 24 HOUR AVERAGE |
| 50 mg/m3 | ANNUAL AVERAGE | |
| PM 2.5 (particulate matter less than or equal to 2.5 microns in diameter) | 35 mg/m3 | 24 HOUR AVERAGE |
| 15 mg/m3 | ANNUAL AVERAGE | |
| SO2 (Sulfur Dioxide) | .140 PPM | 24 HOUR AVERAGE |
| .500 PPM | 3 HOUR AVERAGE | |
| .030 PPM | ANNUAL AVERAGE | |