World Air Quality Report 2024
March 14 , 2025
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- Thirteen of the world's top 20 most polluted cities are in India, with Byrnihat in Assam topping the list.
- Delhi remains the most polluted capital city globally.
- India ranked as the world's fifth most polluted country in 2024, down from third in 2023.
- Overall, 35 per cent of the Indian cities reported annual PM2.5 levels exceeding 10 times the WHO limit of 5 micrograms per cubic metre.
- Air pollution remains a serious health risk in India, reducing life expectancy by an estimated 5.2 years.

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