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

All but one of the world’s top 20 most polluted cities last year were in Asia, with the majority of these cities – 13 – in India, the world’s most populous country. Neighboring Pakistan ...

All but one of the world’s top 20 most polluted cities last year were in Asia, a new study shows. The majority of these cities – 13 – are in the world’s most populous country, India ...

Dhaka remains one of the world’s most polluted cities, with brick kilns, industrial waste, and vehicle emissions worsening air quality. With PM2.5 levels 15 times above WHO limits, Bangladesh ...

HONG KONG — Six out the world’s 10 most polluted cities are in India, while California has the worst air pollution in North America, a new report shows. New Delhi was the most polluted capital ...

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.