The Supreme Court on Monday asked the Commission for Air Quality Management to file an affidavit detailing the measures undertaken to prevent Delhi-NCR's air quality from deteriorating.

Only nine of Delhi's 37 air quality monitoring stations were working on Diwali when the city was covered by a toxic smog of chemicals from 'green' firecrackers, vehicular pollution, and particulate matter from farm fires Supreme Court was told.

Delhi's air quality worsened on Sunday as weak winds trapped pollutants, raising the overall AQI to 366 in the "very poor" category with three monitoring stations recording "severe" air above 400, Centre Pollution Control Board data showed.

As Delhi woke up to another smoggy morning and Air Quality Index (AQI) in several areas climbed to the 'severe' category, senior Congress leader Priyanka Gandhi Vadra called upon the Centre and the BJP-led Delhi government to act immediately.

The national capital witnessed a sharp deterioration in air quality on Sunday morning, with pollution levels slipping deep into the 'very poor' category and touching 'severe' levels in several parts of Delhi-NCR.

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Starting November 1, the Delhi government has prohibited the entry of BS4-engine commercial vehicles to tackle severe air pollution.

Delhi's winter atmosphere is climatologically unsuitable for consistent cloud seeding due to a fundamental lack of sufficient moisture and saturation, particularly during the peak pollution months of December and January, according to a report

The air filter was only available on the Hector previously, but now it will be offered on all the models of the brand.

Burning of crackers during Diwali along with farm fires in neighbouring states and local pollution factors, has made the AQI levels hit the 400-500 range in most parts of Delhi NCR region.