New Delhi, Dec. 13 -- As Delhi's air quality deteriorated further during the day, breaching the 400 mark and slipping into the 'Severe+' category, the Commission for Air Quality Management (CAQM), the Centre's anti-pollution panel, imposed GRAP 4 restrictions in the national capital and its adjoining areas from tonight. This came just hours after the CAQM had enforced GRAP 3 earlier in the day, when air quality levels were hovering above 300.

The Air Quality Index (AQI) stood at 448 at 7 pm on Saturday, according to data from the Central Pollution Control Board (CPCB).

GRAP is a set of emergency measures aimed at tackling severe air pollution.

Under GRAP Stage IV, the commission has rolled out stricter emergency measures in addition to...