Smog engulfs parts of Delhi as AQI remains very poor

Smog engulfed parts of the national capital as the Air Quality Index (AQI) remained in the ‘very poor’ category in Delhi on Friday morning.

Smog engulfs parts of the national capital; visuals from Burari. (Photo: ANI)

Several parts of the national capital were engulfed in smog as the AQI in Delhi remained in the ‘very poor’ category at 339 on Friday morning, according to data provided by the System of Air Quality and Weather Forecasting And Research (SAFAR).

Air Quality was recorded in the ‘very poor’ quality for Delhi University (329), Pusa Road (352), Mathura Road (355), Lodhi Road (327), IIT Delhi (331), Airport (339).

Air quality in Noida also remained in the ‘very poor’ category at 358.

An AQI between zero and 50 is considered “good”, 51 and 100 “satisfactory”, 101 and 200 “moderate”, 201 and 300 “poor”, 301 and 400 “very poor”, and 401 and 500 “severe”.

The minimum temperature this season has remained 2-3 degrees Celsius below normal in the absence of a cloud cover on most days, according to IMD officials.

Clouds trap some of the outgoing infrared radiation and radiate it back downward, warming the ground.

The predominant wind direction remained westerly-north-westerly on most of the days. These winds blow from snowcapped western Himalayas towards the plains.

Another reason for the below normal temperatures is La Nina, a phenomenon associated with the cooling of Pacific waters and an antithesis to El Nino.

Calm winds and low temperatures trap pollutants close to the ground, while favourable wind speed helps in their dispersion.

(With inputs from PTI)

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