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Delhi Air Quality Worsens: 14 Stations Hit "Poor" Level in Worst October Start in Six Years
CPCB data shows Delhi's average AQI over the first four days of October was 174.5, the worst October start in six years; 14 of 43 monitoring stations have reached "poor" level, with Mundka at 273.
Why it matters
Delhi's pollution season is arriving early. If the AQI stays above 200, Stage 1 of the Graded Response Action Plan (GRAP) will be triggered, bringing restrictions on construction and vehicles that directly affect daily life. GRAP Stage 1 has not yet been formally announced.
Full report
Monitoring data from India's Central Pollution Control Board (CPCB) shows Delhi's air quality deteriorated significantly on October 5, edging toward the "poor" category. The citywide average AQI over the first four days of October was 174.5 — the most polluted October start in six years, compared with 119.75 in the same period of 2025 and 167.25 in 2024.
On Sunday, October 4, the citywide average AQI reached 187, the highest so far this season. Of the 43 functioning monitoring stations, 14 have entered the "poor" category: Mundka recorded the worst at 273, followed by CRRI Mathura Road and Narela at 257 each, and Jahangirpuri at 237.
Under the Graded Response Action Plan (GRAP), Stage 1 curbs kick in when the AQI crosses 200. With no rain in the forecast, pollution is expected to worsen.
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