Percent of Good Air Quality Days
Percent of Good Air Quality Days is how many of the days measured had an Air Quality Index of 100 or lower, indicating the air is healthy 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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