Dhaka, March 26 -- Dhaka, the densely populated capital of Bangladesh, ranked 6th among the world's most polluted cities Thursday morning, recording an Air Quality Index (AQI) of 162 at 10:55 am.

Today, the city's air was classified as 'unhealthy', indicating a serious health threat, according to the AQI report.

Beijing in China, Delhi in India, and Chiang Mai in Thailand occupied the first, second, and third spots on the list, with AQI scores of 236, 198, and 181 respectively.

According to the AQI scale, a reading between 50 and 100 is considered 'moderate', with generally acceptable air quality, though sensitive individuals should limit prolonged outdoor exertion. AQI levels of 101-150 are 'unhealthy for sensitive groups', 151-200 is...