Delhi's air quality on Diwali eve reached 369, the highest level since 2016 when AQI hit 404.

Firecrackers contributed 41.1% of the pollution load that night.

PM2.5 concentration on Diwali 2026 stood at 257 µg/m³, up from 201 µg/m³ in 2024 and 134 µg/m³ in 2023.

IITM recorded its highest average PM2.5 at 671.1 µg/m³ at midnight on November 8.

AQI readings that day peaked at 376 at 4 pm, the worst in five years; after Diwali it dropped to 370 at 11 am before easing to 344 by 4 pm.

The government has not yet announced new measures under GRAP-3, but further curbs may loom as pollution remains critically high.