Delhi Air Quality Crosses 300, Enters Very Poor Category

Delhi's air quality index crossed 300 on Monday, entering the very poor category for the first time this season. Readings at 7:05 a.m. stood at 307. The 24-hour average on Sunday had been 261, itself a sharp rise from 117 the day before. A thick haze reduced visibility near India Gate and other central landmarks.

The deterioration followed a short respite brought by rain. Once the rain cleared, emissions from vehicles, construction, and residual agricultural burning in surrounding states combined with still air to push particulate levels upward. The Central Pollution Control Board classifies 301-400 as very poor; prolonged exposure in this range is associated with respiratory stress for sensitive groups.

Authorities have not yet announced a full set of emergency restrictions under the Graded Response Action Plan, but the trajectory places those measures within reach if the index continues to climb. Schools in some districts have already adjusted outdoor activities. Hospitals report the usual seasonal increase in patients presenting with breathing difficulties.

The pattern is familiar. Each winter, temperature inversions and low wind speeds trap pollutants over the Indo-Gangetic plain. Delhi's contribution from local sources is compounded by regional inflows. The brief improvement after rain demonstrates that the baseline load remains high enough for a single weather event to reverse gains within 24 hours.

Residents now face the prospect of several days of elevated pollution until a stronger weather system arrives. The next CPCB bulletin will show whether the morning spike of 307 was the peak or the start of a further climb. For the moment, the city has moved from the moderate-to-poor range into the very poor band, with the associated public-health and visibility consequences already visible on the streets.