Percent of Fair Air Quality Days
Percent of Fair Air Quality Days is how many of the days measured had an Air Quality Index of between 101 and 150, indicating the air is ok for most people but may be unhealthy for sensitive groups, such as people with respiratory conditions like asthma.
| 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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