Top 10 Most Polluted Cities in the World - Page 6 of 9

Patna, India

It is a sprawling ancient city on the bank of river Ganges. According to the report of the World Health Organization, the city is highly congested and noisy. The reason is that the city is used as a transport hub of the country. Due to this, there is no proper way of cleanliness in the city. On the other hand, the city administration is also paying no interesting on this serious issue. So, the average PM2.5 level of the city is 144.