New Delhi

The air quality in Delhi continued to remain in the 'severe' category on Saturday, for the third day in a row.

This even though a slight improvement was noted in the Air Quality Index (AQI) of the city, which stood at 431 this morning.

On Friday, during the corresponding morning period the AQI of the capital city was recorded at 472.

Also, areas in the national capital region (NCR) area - Noida and Gurugram at 7 am this morning recorded an AQI of 529 and 478 respectively, both in the highly toxic 'severe' category.

On Friday, SAFAR (System of Air Quality and Weather Forecasting And Research) said that stubble-burning accounted for 34 per cent to Delhi's particulate matter (PM) 2.5 pollution.

Air Quality Index from 0 to 100 is considered as good, while from 100 to 200 it is moderate, from 200 to 300 it is poor, and from 300 to 400 it is said to be very poor and from 400 to 500 or above it is considered as severe.

Earlier on Friday, Delhi Chief Minister Arvind Kejriwal along with Punjab Chief Minister Bhagwant Mann held a press conference and urged the central government to come forward and lead measures to check severe smog in the national capital region.

"We do not want to play blame game, we are responsible (for smog in NCR)", they added.

CM Kejriwal announced that primary schools in Delhi would be closed from November 5.

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The Delhi government is also mulling implementing the odd-even norms for plying of vehicles in Delhi to contain the pollution caused by vehicular emission.