India, Nov. 12 -- Northwesterlies bring in stubble burning fumes into capital; lowtemperature, slow winds keep them trapped

Air quality in Delhi returned to 'severe' after a brief respite due to several factors. The overall air quality index (AQI) was recorded at 416 around 10 AM, on November 12, 2019, according to the Central Pollution Control Board (CPCB).

Northwesterly wind blew into the national capital region, carrying fume of burning stubble from Haryana and Punjab. The pollutants remained trapped in the city's atmosphere due to low temperatures and low wind speed.

In the Delhi region, 29 of 37 monitoring stations recorded 'severe' air quality.

An AQI between 0-50 is considered 'good', 51-100 'satisfactory', 101-200 'moderate', ...