According to the latest IQAir report, 19 of the 20 most polluted cities in the world ... the growing air quality crisis in parts of Africa. These cities far exceed the World Health Organization ...

Cities in California make up a significant proportion of the country's most polluted metropolitan areas when it comes to air ...

This city of almost 300,000 people, 80 miles north of Zambia's capital of Lusaka, was identified by a 2022 U.N. report as a "sacrifice zone" — one of the most polluted places on the planet.

Sarajevo, the capital city of Bosnia and Herzegovina, declared a state of alert on Wednesday; the concentration of fine particles that afternoon was 47 times higher than the World Health ...