Top 10 Dirtiest Cities in the World in 2018

6. Baku, Azerbaijan

Our Index Score: 35.0
Baku has established sewer systems, but this has not helped it to get out of the top 10 dirtiest cities in the world. The WHO ranking in 2016 placed it at 27.6, and its current score is a significant improvement.
The drilling and shipping of oil have contributed to the alarming air pollution levels, and since the country is reliant on these activities, there is less likelihood that there will be significant changes going forward.
Drinking water is also of poor quality and there are only a few recycling mechanisms. Additionally, the high costs of healthcare and poor sanitation have contributed to high prevalence of infectious diseases.