| Category | Concentration Breakpoint (BP) | Air Quality Index (AQI) | ||
| Low | High | Low | High | |
| Good | 0 | 12 | 0 | 50 |
| Moderate | 12.1 | 35.4 | 51 | 100 |
| Unhealthy for Sensitive Groups | 35.5 | 55.4 | 101 | 150 |
| Unhealthy | 55.5 | 150.4 | 151 | 200 |
| Very Unhealthy | 150.5 | 250.4 | 201 | 300 |
| Hazardous | 250.5 | 500.4 | 301 | 500 |