(Burhaan Kinu / HT Photo)Wednesday became the coldest of the season so far with minimum temperature at 14 degree Celsius. (Burhaan Kinu / HT Photo)“The condition was aggravated by north-westerly winds, which are bringing in smoke from the stubble burning regions of Punjab and Haryana. (Burhaan Kinu / HT Photo)The atmospheric boundary layer (ABL) also plays a key role in determining the level of pollution. The humidity level in Delhi was recorded at 98 per cent at 8.30am on Wednesday. (Burhaan Kinu / HT Photo)Pollution also increases as relative humidity builds up because high moisture helps to trap air and retain more pollutants.

Source: Hindustan Times November 08, 2017 06:45 UTC