Delhi's Smog Season and Stubble Burning — 2026-10-09

Top developments

Worst October Start in Three Years

Delhi’s air quality deteriorated significantly in the first week of October 2026, with the average AQI reaching 136 on Wednesday, October 8, and peaking at 196 on Sunday, October 4. This marks the worst first week of October since 2023, driven by the transition from monsoon to winter conditions which traps pollutants closer to the ground. The spike occurred despite a relatively low count of stubble-burning incidents, suggesting that local vehicular and construction dust are primary contributors at this stage.

Stubble Burning Hotspots Shift to Madhya Pradesh

Contrary to historical patterns where Punjab and Haryana dominate fire counts, recent data indicates a shift in stubble-burning hotspots. On Thursday, October 8, the Indian Agricultural Research Institute recorded only four incidents in Punjab but noted 14 incidents in Madhya Pradesh. This geographic dispersion complicates the traditional narrative of Punjab-centric pollution, as fires in central India also contribute to regional particulate matter loads that can affect NCR air quality through long-range transport.

GRAP Stage-III Restrictions Looming

With AQI levels touching 206 in some pockets and averaging above 170, authorities are preparing for the activation of Graded Response Action Plan (GRAP) Stage-III measures. These restrictions typically include bans on BS-I diesel vehicles, heavy-duty trucks entering Delhi, and non-essential construction activities. The Commission for Air Quality Management (CAQM) is monitoring daily averages closely, with Stage-III likely to trigger if the AQI remains in the "Poor" category (201-300) for two consecutive days.

Political Blame Game Intensifies

Delhi Chief Minister Rekha Gupta has publicly criticized the Punjab government led by Bhagwant Mann, alleging failures in managing stubble burning despite central funds and machinery subsidies provided. This political friction highlights the ongoing inter-state coordination challenges, even as scientific data suggests that local sources contribute significantly more to Delhi’s PM2.5 levels than crop burning during early winter phases.

Local view

Local Hindi media outlets like Navbharat Times and AajTak are focusing heavily on the health impacts and the potential for school closures under GRAP norms. Punjabi Jagran reports that administration officials in districts like Faridkot are deploying drones to monitor stubble burning, aiming to catch offenders in real-time to enforce fines. Meanwhile, Punjab Tribune highlights the Agriculture Department honoring 150 farmers who adopted zero-tillage or other non-burning methods, signaling a push for positive reinforcement alongside punitive measures.

Context & numbers

• AQI Peaks: The AQI hit 196 on Oct 4 (highest since July 13) and averaged 136 on Oct 8.
• Fire Counts: Early October saw low counts in Punjab (4 incidents on Oct 8) but higher activity in Madhya Pradesh (14 incidents).
• GRAP Triggers: Stage-III is triggered when AQI is between 201-300 for two days; Stage-IV at >400. Current readings are hovering near the Stage-III threshold.
• Historical Context: The 2025 winter season saw farm fires account for only 3.5% of Delhi's PM2.5, down from 10.6% in previous years, underscoring the importance of local emission controls.

On the radar

• Supreme Court Hearing on Green Crackers: The SC has approved controlled use of "green crackers" for Diwali 2026, but strict conditions apply. Enforcement agencies are preparing for compliance checks starting mid-October.
• Peak Stubble Season: Historically, fire counts peak in late October and November. The current low counts in Punjab may be due to delayed harvesting or effective enforcement; a surge is expected in the next two weeks.
• Weather Forecast: Meteorological departments predict reduced wind speeds and lower temperatures in the coming week, which will further trap pollutants and likely push AQI into the "Poor" category consistently.