New Delhi, Dec. 27 -- The Air Quality Index (AQI) in the national capital deteriorated sharply on Saturday evening, slipping into the "severe" category, with the overall AQI touching 390, according to the Central Pollution Control Board (CPCB).

Several areas across Delhi-NCR recorded even worse air quality, with AQI levels crossing the 400 mark.

Patparganj registered an AQI of 431, while Shivaji Park recorded 400. Nehru Nagar saw the highest reading at 442, followed by Shadipur at 429. Sirifort reported an AQI of 402, and RK Puram recorded 412, indicating severe pollution levels across the region.

Earlier on Saturday morning, Delhi's air quality had worsened, slipping back into the 'Very Poor' category, with the Air Quality Index (AQI)...