| PM2.5 | Air Quality Rating (per EPA) |
| 0 - 12 | Good |
| 12.1 - 35.4 | Moderate |
| 35.5 - 55.4 | Unhealthy for Sensitive Groups |
| 55.4 - 150.4 | Unhealthy |
| 150.5 - 250.4 | Very Unhealthy |
| 250.5+ | Hazardous |