Full Breakdown
Delhi’s Air Quality Set to Slip into “Poor” Category as Winter Approaches
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Deteriorating Air-Quality Forecast
The Air Quality Early Warning System (AQEWS) predicts Delhi’s Air Quality Index (AQI) will shift from the “moderate” range (101-200) to the “poor” range (201-300) on Wednesday, October 21 and stay there through Friday, October 23. The outlook for the next six days also remains “poor.”
Background & Context
Winter in Delhi brings lower temperatures, weaker winds and a reduced atmospheric mixing height, limiting pollutant dispersion. Recent stubble-burning incidents in neighbouring states—seven fires each in Punjab and Uttar Pradesh, four in Madhya Pradesh and one in Haryana—have added to the pollutant load. The city’s Dussehra fireworks may also contribute particulate matter, though the exact impact is unquantified.
Data & Statistics
| Metric | Value | Source |
|---|---|---|
| AQI on Tuesday (moderate) | 179 | NDTV, Indian Express, Livemint |
| AQI at early Wednesday stations | Bawana 273, Dwarka 262, DTU 248, Karni Singh 230 | IndiaToday |
| Transport sector share of PM2.5 (Oct 19) | 23.02 % | Indian Express, HT |
| Residential emissions share (Oct 19) | ~6 % | Indian Express |
| Stubble-burning events detected (six states) | 19 | NDTV, IndiaToday |
| Lowest minimum temperature (Monday) | 17.1 °C (1.3 °C below normal) | NDTV, New Indian Express |
| Poor-category stations on Monday | 2 of 58 (Pusa 281, Chandni Chowk 202) | NDTV, IndiaTimes |
| Highest AQI this season (July 13) | 246 (poor) | HT, Livemint, NDTV |
Official Statements & Responses
- The Delhi government will launch its Winter Action Plan on November 1, featuring a “No PUC, No Fuel” policy, entry restrictions for non-BS-VI vehicles registered outside Delhi, a 50 % work-from-home directive, construction-dust limits and intensified road-sweeping. The plan aligns with the Commission for Air Quality Management’s revised Graded Response Action Plan (GRAP).
- The AQEWS bulletin noted a ventilation index below 6,000 m² s?¹ and average wind speeds under 10 km h?¹, conditions that hinder pollutant dispersion.
Verbatim Quotes
- “No significant change in maximum temperatures is likely during the next 48 hours and rise by 1-3 degrees Celsius is expected thereafter,” — the official
Conflicting Reports & Gaps
- AQI figures differ: NDTV and Livemint report a city-wide AQI of 179 on Tuesday, while IndiaTimes cites 161 at 9 am the same day.
- Number of poor-category stations varies: NDTV notes two stations on Monday; IndiaTimes reports 22 stations on Sunday, including a reading of 430 at ITO. Timing differences likely explain the discrepancy.
- Fireworks impact remains unquantified; sources acknowledge possible added particulate matter but lack measured values.
What’s Next
- AQEWS forecasts “poor” air quality through October 23 and the same category for the following six days.
- The Winter Action Plan, starting November 1, will enforce stricter vehicular and construction controls.
- Meteorological agencies expect continued low temperatures and weak winds, sustaining the risk of poor air quality until winter conditions evolve.