New Delhi (CNN) — It’s easy to tell when it’s smog season in New Delhi; the air gets darker, heavier and starts scratching the throats and testing the lungs of the city’s 34 million residents.

Twenty-one of the world's 30 most polluted cities are in India, according to IQAir's 2019 world air quality report. The company's ranking of the most polluted cities comes as President Trump is in ...

Dhaka, June 3 -- Dhaka, the capital of Bangladesh, ranked 11th among the world's most polluted cities on Wednesday morning, with an Air Quality Index (AQI) score of 96.

The Air Quality Index in Pakistan's Lahore stood at 1,900 on Sunday, its highest ever, prompting the country to write a letter to the Indian government to open a dialogue on the issue. Even as the AQI ...