After a short-lived relief, Delhi's air pollution levels inched towards the 'severe' zone due to calm winds, low temperatures and high humidity.
Experts said the situation is likely to worsen in the next 24 hours, with some relief expected on Saturday.
The overall air quality index (AQI) in the national capital read 355 at 6:30 am on Friday. The PM2.5 level was recorded at 191 while the PM10 level stood at 311.
The AQI for Rohini (414), Anand Vihar (422), Nehru Nagar (410), Dwarka Sector 8 (404) and Bawana (407) entered the 'severe' zone.
Neighbouring Ghaziabad (415), Greater Noida (402),