10 Most Polluted Cities in the World
The WHO report listed 1,600 cities in 91 countries and ranked them according to the quality of their air which is measured for concentrations of PM10 and PM2.5 that is particles smaller than 10 or 2.5 microns which are harmful toxins that can cling to the lungs and cause diseases.
Pakistan records the highest level over all of the 91 countries in the WHO air pollution database.
Interestingly, 13 of the 20 cities on the list are Indian.
1. Delhi – India
2. Patna – India
3. Gwalior – India
4. Raipur – India
5. Karachi – Pakistan
6. Peshawar – Pakistan
7. Rawalpindi – Pakistan
8. Khoramabad – Iran
9. Ahmedabad – India
10. Lucknow – India
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