Dhaka, Feb. 5 -- Dhaka, the densely populated capital of Bangladesh, ranked third among the world's most polluted cities on Thursday morning, recording an Air Quality Index (AQI) of 189 at 10:24 am.

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

Delhi in India, Hanoi in Vietnam, and Lahore in Pakistan occupied the first, second, and fourth spots on the list, with AQI scores of 222, 198, and 188 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...