Summary:
At 4 pm on Sunday, Delhi’s air was moderately polluted, with the air quality index value reading at 171. Scientists have forecast a relatively cleaner Tuesday, when the air quality is expected to be very poor. (Express photo by Renuka Puri)It took 14 hours and a drastic change in wind direction for Delhi’s air to turn from moderate — a rarity in the month of November — to severe. (Express photo by Renuka Puri) Traffic cops wear masks as air quality worsened on Monday. Traffic cops wear masks as air quality worsened on Monday..