[REVISION HISTORY]

Weather transitions and air quality shifts in Delhi-NCR

Updated 26 times since CLSTR started tracking revisions of this situation.

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2026-10-24 23:48 UTC → 2026-10-25 05:33 UTC · added ~~removed~~

The Delhi-NCR region has undergone several weather transitions as the southwest monsoon withdrew and seasonal patterns shifted. In late September, the region experienced a significant temperature dip, with Delhi recording its lowest September minimum since 2008 at 21°C following rainfall and a western disturbance. This precipitation temporarily improved air quality, bringing the Air Quality Index (AQI) into the ‘satisfactory’ category. However, as rainfall subsided and skies cleared toward the end of September and early October, temperatures stabilized and air quality began to decline. By the first week of October, the average AQI reached 171, marking the most polluted first week of October in three years. In late October, ~~the region experienced~~ a sudden weather shift occurred when heavy rainfall, thunderstorms, and hailstorms hit Delhi, Noida, Ghaziabad, Gurugram, and Faridabad. ~~This weather event, attributed~~ Attributed to a western disturbance acting as a cyclonic circulation, ~~led to a noticeable drop in temperatures and~~ this event brought a return to early winter chill. The rainfall and increased wind speeds provided relief from pollution; following a period of poor air quality that triggered GRAP-1 restrictions, the AQI improved to ~~191, categorized~~ a moderate level of approximately 191. Despite this improvement, pollution levels remain inconsistent across the region, with monitoring stations such as ~~moderate. Experts suggest~~ IIT Delhi and Alipur reporting AQI levels in the ‘poor’ category, exceeding 200. The India Meteorological Department (IMD) forecasts partly cloudy skies with temperatures between 16°C and 33°C. While immediate rainfall is not expected, a ~~‘wash-out effect’ from~~ depression in the ~~rain~~ Bay of Bengal is projected to intensify into a cyclonic storm by October 27, which may ~~maintain controlled pollution levels for several days.~~ influence regional weather patterns.

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