10 Most Polluted Cities in the World in 2024

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2. New Delhi, India

AQI Ranking: 2 

IQAir Ranking: 9

Being a major capital city of India, New Delhi is one of the country’s biggest commercial and economic powerhouses. New Delhi is second on the list of most polluted cities in the world, with a PM2.5 concentration of 46µg/m³, exceeding the WHO annual air quality guideline value by 9.2 times. The primary reasons for high pollution levels in New Delhi are vehicles with inefficient engines, factories, and industries.

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