Why in News Delhi’s air quality slipped into the “ very poor” category on Saturday and is unlikely to improve over the next three days. D...
Why in News
Delhi’s air quality slipped into the “very poor” category on Saturday and is unlikely to improve over the next three days.
Delhi’s 24-hour average AQI was 304 (very poor) at 4 p.m. on Saturday, up from 261 (poor) a day earlier, as per the daily bulletin of CPCB.
Air Quality Index (AQI)
The AQI is a measure of how clean or polluted the air is.
It is calculated using the concentrations of five major pollutants:
Ground-level ozone, Carbon monoxide, Sulfur dioxide,Particulate matter, Nitrogen dioxide.
AQI Category and Color
The AQI is divided into six categories,
Good (0-50): Green
Moderate (51-100): Yellow
Unhealthy for Sensitive Groups (101-150): Orange
Unhealthy (151-200): Red
Very Unhealthy (201-300): Purple
Hazardous (301-500): Maroon
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