The World's Most Polluted Cities

According to the IQAir World Air Quality Report not one country in the whole world managed to meet the World Health Organization’s (WHO) PM2.5 annual air quality guidelines in 2021. In 2021 the five most polluted countries were: Bangladesh, Chad
Pakistan, Tajikistan and India.

IQAir's annual air quality report is based on an analysis of air pollution data collected from air monitoring