New Delhi, March 11 -- Delhi was the most polluted city in 2024-25, recording the highest annual PM 2.5 levels and extended periods of 'severe' air quality in winter, while Patna was the second-most polluted city, according to a new analysis by Climate Trends.

Bengaluru, however, stood out for maintaining the lowest and most stable air quality, demonstrating a degree of 'structural air-quality resilience' compared to other major metros, the report released on 11 March said.

Climate Trends is a research-based consulting and capacity-building initiative that aims to bring greater focus to environmental issues, climate change, and sustainable development.

The findings in the report titled 'Meteorology-Driven Persistence of PM2.5 Pollution...