Air Quality Index Rating System
| AQI Rating |
AQI Index |
Effects |
| Good |
1-25 |
No known harmful effects to soil, water, vegetation, animals, visibility or human health. |
| Fair |
26-50 |
Adequate protection against harmful effects to soil, water, vegetation, animals, materials, visibility and human health. |
| Poor |
51-100 |
Not all aspects of the environment are adequately protected from possible adverse effects. Long-term control action may be necessary, depending on the frequency, duration and circumstances of the readings. |
| Very Poor |
>100 |
In this range, further deterioration of air quality and continued high readings could pose a risk to public health. |
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