Special Report

28 Most Polluted Cities in the World


To identify the most polluted cities in the world, 24/7 Wall St. ranked nearly 3,000 cities worldwide based on the annual average concentration of PM2.5 per square meter of air. We only considered the most recent air quality data from the WHO Global Ambient Air Quality Database (update 2018). Only cities for which PM2.5 concentration was directly measured and not imputed from other measures of air pollution were considered. Though it was not factored into the ranking, we also included PM10 concentration. Pollution data came from the World Health Organization. Population figures also came from the WHO Global Ambient Air Quality Database (update 2018). For cities not included in the U.N. report, population estimates came from a range of sources.

Sponsored: Find a Qualified Financial Advisor

Finding a qualified financial advisor doesn’t have to be hard. SmartAsset’s free tool matches you with up to 3 fiduciary financial advisors in your area in 5 minutes. Each advisor has been vetted by SmartAsset and is held to a fiduciary standard to act in your best interests. If you’re ready to be matched with local advisors that can help you achieve your financial goals, get started now.