The World Health Organisation (WHO) released a report that estimeted 8.2 million people died due to causes linked to air pollution. This number is unfortunately on the rise. The most harmful pollutant for human health is a particle found in smoke, smog, dust and lodges in the lungs causing long term health problems like asthma and chronic lung disease. The most polluted cities on earth have 15 times the amount of pollution compared to the accepted WHO levels. Here is a list of the most polluted cities in the world based on WHO measurements.

1. Delhi, India – 153 µg/m3 of PM 2.5

2. Patna, India – 149 µg/m3 of PM 2.5

3. Gwalior, India – 144 µg/m3 of PM 2.5

4. Raipur, India – 134 µg/m3 of PM 2.5

5. Karachi, Pakistan – 117 µg/m3 of PM 2.5

6. Peshawar, Pakistan – 111 µg/m3 of PM 2.5

7. Rawalpindi, Pakistan – 107 µg/m3 of PM 2.5

8. Khorramabad, Iran – 102 µg/m3 of PM 2.5

9. Ahmedabad, India – 100 µg/m3 of PM 2.5

10. Lucknow, India – 96 µg/m3 of PM 2.5