Air Quality Index
From Green Wiki
The Air Quality Index (AQI) is a standardized indicator of the air quality in a given location. It measures mainly ground-level ozone and particulates but may also include sulfur dioxide, and nitrogen dioxide. Various agencies around the world measure such indices, though definitions may change between places.
- 0-50 Good is usually green
- 51-100 Moderate is usually yellow
- 101-150 Unhealthy for sensitive groups is usually orange
- 151-200 Unhealthy is usually red
- 201-300 Very unhealthy is usually purple
- 301-500 Hazardous is usually maroon
The EPA's AQI 100 corresponds to 0.08 ppm ozone, and to other levels for other pollutants. Source: EPA
