Why in news?
What the Air Quality Index (AQI)?
How it is calculated?
Colour | Level of Health Concern | AQI Values |
Green | Good | 0 to 50 |
Yellow | Moderate | 51 to 100 |
Orange | Unhealthy for sensitive groups | 101 to 150 |
Red | Unhealthy | 151 to 200 |
Purple | Very Unhealthy | 201 to 300 |
Maroon | Hazardous | 301 to 500 |
Source: Indian Express