The countries with the worst air quality included Bangladesh and India, according to an annual report from IQAir.

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 ...

All but one of the world’s top 20 most polluted cities last year were in Asia ... the capital of Chad in central Africa – which was named the country with the worst air pollution.

Chad, in central Africa, is the world’s most polluted country, while California has the worst air pollution in North America, according to an IQAir report.

Which US cities are the most polluted? While Ontario ... systems in many parts of the world," IQAir said. For example, in Africa, real-time, publicly accessible air quality monitoring data ...

The U.N. has identified Kabwe, a city of almost 300,000 people in Zambia, as one of the most polluted places on the planet.

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.