Percent of Hazardous Air Quality Days
Percent of Hazardous Air Quality Days is how many of the days measured had an Air Quality Index of between 301 and 500, indicating the air is dangerous for anyone to breathe.
| 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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