The air quality in the national Capital on Saturday deteriorated to the ‘severe’ category for the fourth time this season. The overall air quality index (AQI) of the city stood at 421, which falls in the ‘severe’ category, Central Pollution Control Board (CPCB) data showed.
The CPCB said that twenty-eight areas of the national capital recorded ‘severe’ air quality, while seven recorded ‘very poor’ air quality. The authorities said that thick smog engulfed the city and prevented dispersion of pollutants.
The overall PM2.5 level - fine particulate matter in the air with a diameter of less than 2.5 micrometre — was recorded at 296 and the PM10 level at 466 in the city, the CPCB said.