‘On Nov. 2, 21 of the 37 air quality monitoring stations in Delhi registered in the “severe” category. Since then, the city has been grappling with its worst-ever pollution crisis. On the Air Quality Index, an international metric used by public health officials that accounts for a range of major air pollutants, any reading above 100 is considered unhealthy. In some areas of Delhi this week, the AQI recorded well over 900 according to daily bulletins by India’s Central Pollution Control Board.’
Source:Â As Delhi Chokes On Smog, India’s Health Minister Advises: Eat More Carrots | NPR