From ‘poor’ to ‘very poor’ in a day: Why Delhi’s air quality is swinging wildly this week

Delhi’s air quality has worsened sharply, slipping from the ‘poor’ to the ‘very poor’ category within a day. Experts attribute this sudden decline to smoke from stubble burning in neighbouring states, emissions from vehicles and industries, and calm weather with low wind speeds that trap pollutants. Changing wind direction has also carried more pollution from Haryana and Punjab, while the existing local pollution has made conditions even worse.

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