Particulate Matter Concentration and Air Quality Index Scale
|
PM2.5 or PM10 concentration in ng/L |
Air Quality Index (AQI) |
Air Pollution Level |
|
0 to 12 |
0 to 50 |
Good |
|
>12 to 35.5 |
>50 to 100 |
Moderate |
|
>35.5 to 55.5 |
>100 to 150 |
Unhealthy for Sensitive Groups |
|
>55.5 to 150.5 |
>150 to 200 |
Unhealthy |
|
>150.5 to 250.5 |
>200 to 300 |
Very Unhealthy |
|
>250.5 to 350.5 |
>300 to 400 |
Hazardous |
| >350.5 to 500.5 | >400 to 500 | Hazardous |
Source: US-EPA 2016 standard.
Click here to show more information on AQI and interpretation. Note that 1 ng/L = 1 µg/m3, i.e. one nanogram per litre = one microgram per cubic metre.