The area with the highest AQ Index (as of ) in is in the area. () is measuring at (). This means
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 6 minutes ago
Below is a list of cities in St. Clair County where we track and forecast the AQ index. Click on a city name to get the current AQ index as well as any available forcasts.
| Port Huron | Marysville | Pearl Beach | St. Clair | Marine City |
| Algonac | Yale | Capac | Lakeport | Ruby |
| Emmett |