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Chennai's Air Quality Dips: Weather Traps Pollution
12 Mar
Summary
- Weather alone can shift Chennai's air pollution by 40%.
- Low winds and high humidity trap PM2.5 near the ground.
- Chennai shows winter air quality deterioration, a new trend.
Air pollution in Chennai can shift by as much as 40% solely due to weather phenomena, according to a Climate Trends analysis of 2024-2025 data. Meteorological factors, specifically low wind speeds and high humidity, are shown to significantly amplify PM2.5 levels by trapping pollutants close to the ground.
The study highlights an emerging pattern of winter air quality deterioration in Chennai, a trend previously more associated with northern Indian cities. While Chennai historically experienced less pollution, it is now recording higher PM2.5 concentrations during winter. This vulnerability is linked to weak winds and stagnant atmospheric conditions that limit pollutant dispersion.
Researchers observed an increase in Chennai's annual average PM2.5 levels in 2025, indicating a potential shift towards a more persistent pollution challenge. The analysis, which also covered Delhi, Patna, Kolkata, Mumbai, and Bengaluru, proposes reforms to the National Clean Air Programme (NCAP) Phase III. These include season-specific targets and dynamic weather-triggered action plans.
