In view of the rising air pollution in the national capital, Delhi Education Minister Atishi on Sunday said that primary schools will remain closed till November 10, and for classes 6 to 12, schools can opt to hold online classes.

A toxic haze lingered over Delhi for the sixth consecutive day on Sunday as pollution levels once again reached the severe plus category due to unfavourable wind conditions, particularly calm winds during the night.

The air quality index deteriorated from 415 at 4 pm on Saturday to 460 at 7 am on Sunday.

The concentration of PM2.5, fine particulate matter capable of penetrating deep into the respiratory system and triggering health problems, exceeded the government-prescribed safe limit of 60 micrograms per cubic metre by seven to eight times at multiple locations throughout Delhi-NCR. It was 80 to 100 times the healthy limit of 5 micrograms per cubic meter set by the WHO.

Under the Centre’s air pollution control plan, all emergency measures, including a ban on polluting trucks, commercial four-wheelers, and all types of construction, are mandated to be initiated and enforced in the National Capital Region if the AQI crosses the 450-mark.

Data from the Central Pollution Control Board shows that Delhi’s air quality index increased by over 200 points between October 27 and November 3, culminating in a descent into the ‘severe plus’ category (above 450) on Friday.

Friday’s 24-hour average AQI (468) was the worst since the previous high of 471 recorded on November 12, 2021.

The air quality in neighbouring Ghaziabad (410), Gurugram (441), Noida (436), Greater Noida (467), and Faridabad (461) also reported hazardous air quality.