9pm-4am: Worst phase of pollution in Gurgaon on Diwali as PM 2.5 breached severe-plus | Gurgaon News - The Times of India
PM2.5 levels rose sharply in Gurgaon after 9pm on Diwali night, with three of the city’s four active monitoring stations recording hourly levels above 450 micrograms per cubic metre (severe-plus) between 11pm and 4am. CPCB data shows Teri Gram recorded the highest concentration of 585 µg/m³ between 3am and 4am on Monday, while Sector 51 crossed 500 µg/m³ before midnight.