Delhi’s air quality enters ‘severe’ category, worst grade on pollution scale

As HT reported earlier, Delhi’s air quality deteriorated sharply on Thursday, with the city’s PM2.5 concentration more than doubling in 24 hours.

Delhi’s air quality deteriorated into the “severe” zone — the worst grade on the government’s pollution scale— on Friday morning, with a thick, smoky haze continuing to envelop the Capital.

A man walks in the Red Fort premises as a layer of haze covers the area, in New Delhi, (PTI)

According to HT’s real-time air quality dashboard, the Air Quality Index (AQI) stood at 403 at 7.30am, 82 points higher than the previous 24 hours.

Delhi last recorded severe air quality on January 19, when the AQI stood at 410.

As HT reported earlier, Delhi’s air quality deteriorated sharply on Thursday, with the city’s PM2.5 concentration more than doubling in 24 hours to 244 micrograms per cubic metre by 6pm — four times the national standard.

CPCB classifies an AQI of 0-50 as “good”, 51-100 as “satisfactory”, 101-200 as “moderate”, 201-300 as “poor”, 301-400 as “very poor” and 401-500 as “severe”.

According to HT’s dashboard, 32 of the 59 reporting stations were in the severe category, with IIT Delhi recording the highest rating of 488.

According to HT's analysis, burning has shifted later each year (98% of the fire heat Meteosat recorded in 2025 occurred after 3pm, compared with 94% in 2024), so the two counts can differ for that reason alone. Both are undercountsbecause most of the burning now occurs after the satellite passes at about 1.45pm.

According to HT’s dashboard, 32 of the 59 reporting stations were in the severe category, with IIT Delhi recording the highest rating of 488.