Reports indicate that the Swiss air quality monitor's graph shows Lahore last reached the "hazardous" category on November 28, making this recent AQI spike the first in almost three weeks.
The revelry took the air quality index above 350 at most stations. The AQI for Anand Vihar was 386 at 11 pm on the night of October 31 â much higher than last year's 302 on Diwali night.