After air pollution levels in the national capital worsened, authorities enforced Stage III of the Graded Response Action Plan (GRAP) with immediate effect on Tuesday. The move came after Delhi’s overall Air Quality Index (AQI) slipped into the ‘severe’ category for the first time this season, rising sharply from 362 on Monday to 425 (as of 9 am) on Tuesday.

According to data from the Central Pollution Control Board (CPCB)’s Sameer app, at 7 a.m. on Tuesday, 34 out of Delhi’s 39 active monitoring stations recorded ‘severe’ AQI levels; several at the higher end of the range. The AQI touched 462 in Bawana, 460 in Wazirpur, and 452 in both Mundka and Punjabi Bagh.

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For context, an AQI between 51 and 100 is classified as ‘satisfactory’, 101 to 200 as ‘moderate’, 201 to 300 as ‘

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