Delhi AQI hits 494 in ‘one of the worst pollution episodes seen in November in recent years’; AQI 500 in some areas
The average PM2.5 level was 354 micrograms per cubic metre, which is over 20 times the standard set by the World Health Organization (WHO). The PM10 levels were also above the threshold by around 12 times. IMD has issued a yellow alert. The average air quality index (AQI) in Delhi was reported to be inching …