According to Central Pollution Control Board (CPCB) data, 15 areas recorded ‘severe’ pollution, while 21 areas witnessed ‘very poor’ air quality on Saturday.
In the national Capital region (NCR), Ghaziabad recorded 'severe' air quality, while Faridabad, Gurgaon and Noida recorded 'very poor' air quality.
The overall PM2.5 level -- fine particulate matter in the air with a diameter of less than 2.5 micrometer — was recorded at 234 and the PM10 level at 380 in Delhi, the CPCB said.