Percent of Bad Air Quality Days
Percent of Bad Air Quality Days is how many of the days measured had an Air Quality Index of 101 or higher, indicating the air is unhealthy to breathe.
Air Quality Index Health Levels & Bounds
| Health Level | Lower Bound | Upper Bound |
| Very Healthy | 0 | 50 |
| Healthy | 51 | 100 |
| Fair (unhealthy for sensitive groups) | 101 | 150 |
| Unhealthy | 151 | 200 |
| Very Unhealthy | 201 | 300 |
| Hazardous | 301 | 500 |
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