Full Breakdown
Delhi’s Air Quality: September Improvement Amidst October Deterioration Risks
By Drooid · · How we work
Recent Moderate Slip Linked to Stubble Burning and Weather Shift
On the Wednesday after a five-day stretch of “satisfactory” air, Delhi’s 24-hour average AQI rose to 129 (moderate), according to NDTV. Satellite data from the Indian Agricultural Research Institute identified 19 stubble-burning events that day—seven each in Punjab and Uttar Pradesh, four in Madhya Pradesh, and one in Haryana. The IIT Delhi monitoring station recorded a poor AQI of 207 at 6 p.m.
The shift coincided with a weakening low-pressure system over central Uttar Pradesh, which reduced cloud cover and rainfall, allowing daytime temperatures to climb. Moneycontrol recorded the 24-hour average AQI at 107, a jump of more than 30 points within 24 hours.
September 2026 Shows Record Low Monthly AQI
The Ministry of Environment, Forest and Climate Change (MoEFCC) announced that Delhi’s monthly average AQI of 102 for September 2026 is the lowest in the last five years. The ministry also reported 194 days with a daily average AQI below 200 in the January-September period, the highest count since 2022.
Average PM2.5 concentration from January 1 to September 28, 2026 was 69 µg/m³, matching the 2025 level and the joint-lowest figure since 2022.
Farm-Fire Incidents Decline in Neighboring States
News18 documented a sharp drop in farm-fire incidents in Punjab and Haryana during mid-September: 54 incidents between September 15-29, 2026 (52 in Punjab, 2 in Haryana). NDTV’s broader satellite count showed 114 residue-burning events across six states from September 15-30, 2026, mainly in Punjab and Uttar Pradesh.
Government Measures Ahead of Winter
In anticipation of the winter pollution season, the Delhi government announced restrictions effective November 1, 2026:
- Ban on construction and demolition until January 31, 2027.
- Doubling of parking fees at authorized sites (except Metro facilities) until February 28, 2027.
- Work-from-home for 50 % of the workforce and staggered office timings for municipal and state offices.
The Chief Minister’s Office emphasized that “clean air remains a year-round priority for the Delhi Government. Focused action is being taken across major sources of pollution through strict enforcement, continuous monitoring and coordinated efforts across departments,” — CMO Delhi.
Weather Outlook and Potential Air-Quality Rise
Forecasts from Moneycontrol and Hindustan Times predict mainly clear skies through early October, with maximum temperatures around 34 °C on October 1-2 and minimums near 24 °C. Hindustan Times warned that dry north-west winds will dominate October 3-8, bringing “October Heat” with temperatures 37 °C–40 °C across Delhi-NCR.
Manoj Kumar of the Centre for Research on Energy and Clean Air linked the unusually warm September nights to El Niño and a 20 % rainfall deficiency up to September 25, noting that pollutants are likely to accumulate again as the monsoon withdraws.
Data Summary
- September 2026 monthly AQI: 102 (MoEFCC)
- Days with AQI < 200 (Jan-Sep): 194 (MoEFCC)
- PM2.5 (Jan 1-Sep 28): 69 µg/m³ (MoEFCC)
- Stubble-burning events (Sep 15-30): 114 across six states
- Farm-fire incidents (Punjab + Haryana, Sep 15-29): 54
- AQI on moderate-slip day: 129; 107
- Construction ban: Nov 1 2026-Jan 31 2027
- Parking fee increase: Nov 1 2026-Feb 28 2027
What’s Next
- November 1, 2026: Commencement of construction ban, parking-fee doubling, and 50 % work-from-home policy.
- October 1-2, 2026: Expected maximum temperatures near 34 °C; minimums around 24 °C.
- October 3-8, 2026: Anticipated dry north-west winds raising daytime highs to 37 °C–40 °C.
Authorities have pledged continuous monitoring as temperatures rise and rainfall wanes, aiming to prevent a reversal of September’s air-quality gains.
