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World’s Most Polluted Cities 2025
December 15 , 2025
27 days
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- New Delhi, India, holds the first rank for the worst air quality index (AQI).
- Hanoi, Vietnam, was ranked the second most polluted city in the world in 2025.
- High levels of PM2.5 pollutants in Hanoi exceed World Health Organization (WHO) daily exposure limits.
- The ranking was reported by a Swiss air quality monitoring company.
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