Delhi's air quality worsens to 'severe'; thick smog envelops capital

The air quality in Delhi fell into the 'severe' category on Thursday as residents awoke to a thick smog blanketing the national capital. According to data from the Central Pollution Control Board (CPCB), Delhi recorded an average AQI (Air Quality Index) of 402 Thursday noon. Reportedly, pollution levels have risen primarily due to calm winds and a spike in farm fires.

source https://www.newsbytesapp.com/timeline/india/68059/321246/delhi-aqi-air-quality-worsens-to-severe