SC seeks explanation from Delhi government on implementation of Graded Response Action Plan (GRAP) and says it is in favour of continuance of fourth stage of GRAP even in case of AQI level reduces below 400 level in Delhi Delhi Air Pollution Supreme Court Hearing Live Updates: We want to know what action government has taken, asks Justice Oka

The top court also directed Delhi and NCR governments to set up a grievance redressal mechanism to report violations of the step

Dr Vikas Mittal, a Pulmonologist at CK Birla Hospital, Delhi, explains how emergency measures like GRAP 4 can help alleviate pollution's harmful effects

Delhi's Air Quality Index (AQI) stood at 484, the worst this season, at 8 am, according to the Central Pollution Control Board (CPCB).

A bench of Justices Abhay S Oka and Augustine George Masih pointed out that there was a delay in implementation of preventive measures under stage 4 of the Graded Response Action Plan (GRAP) even after the Air Quality Index (AQI) touched alarming levels in the national capital.

Supreme Court has ordered the continuation of GRAP-4 restrictions in Delhi-NCR due to alarming air pollution levels, emphasising the urgent need for action to combat the deteriorating air quality

Air pollution in India's capital Delhi has soared to extremely severe levels, choking residents and engulfing the city in thick smog. Monitors recorded pollution levels of 1,500 on the Air Quality Index (AQI) at 15:00 IST (09:30 BST),

The Supreme Court is scheduled to hear on Monday a plea seeking enforcement of measures to curb air pollution in the national capital. Delhi woke up to toxic air conditions on Sunday as the Air Quality Index (AQI) was recorded in the "severe" category.

As of 10am today, Delhi's AQI stands in the "severe" category. Anand Vihar at 457, Chandni Chowk at 388, Lodhi Road at 375, Jahangirpuri at 465, whereas in the NCR region, Ghaziabad is at 425, Noida Sector 1 at 268 and Gurugram Sector 51 at 281.