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Delhi had worst air quality in 2024–25, with Patna second, due to weather and emissions.
A 2025 study by Climate Trends, using CPCB data, found Delhi had the highest annual PM2.5 levels and longest severe air quality periods in 2024–25, especially in winter, while Bengaluru was the most resilient major Indian city.
Patna ranked second in pollution severity, driven by stagnant air.
The analysis of six cities showed weather conditions like low wind speeds and high humidity can increase PM2.5 by up to 40%, worsening pollution even without higher emissions.
Experts urge reforms to India’s NCAP Phase-III, including weather-adjusted targets and action plans, to better address climate-driven pollution spikes.
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Delhi tuvo la peor calidad del aire en 2024-25, con Patna en segundo lugar, debido al clima y a las emisiones.