India, Oct. 20 -- Delhi-NCR is ringing in Diwali amid toxic air and anti-pollution curbs under the Stage 2 of the Graded Action Response Plan (Grap 2) that kicked in on Sunday evening as the Air Quality Index (AQI) in the capital city entered the "very poor" category.

On Sunday, Diwali eve, Delhi's air quality worsened further late at night, with 24 out of 38 monitoring stations recording pollution levels in the "very poor" category, while Anand Vihar entered the 'severe' zone with AQI readings crossing 400, according to CPCB data cited in a PTI news agency report.

On Monday morning as well, the AQI of most of the stations was over 300 while that of Anand Vihar was 400-plus.

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