New Delhi, Nov. 13 -- As Delhi choked on "severe" air for the second straight day, smoke from stubble fires in Punjab and Haryana made up nearly a quarter of the city's PM2.5 load, the highest share this season. Data from the Centre's Decision Support System (DSS) showed that stubble burning contributed 22.47% to Delhi's PM2.5 on Wednesday, up from 15.45% on Tuesday and 13.68% on Monday. Tuesday marked the capital's first "severe" air day this season, with northwesterly winds, which are ideal for carrying stubble smoke from Punjab and Haryana, prevailing through the day. The 24-hour average AQI stood at 428 on Tuesday and 418 on Wednesday. Forecasts by the DSS indicate a decline in the coming days, possibly due to a shift in wind direction,...