Dhaka, Feb. 6 -- Dhaka, the densely populated capital of Bangladesh, ranked fourth among the world's most polluted cities on Friday morning, recording an Air Quality Index (AQI) of 204 at 09:08 am.

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

Lahore in Pakistan, Hanoi in Vietnam, and Cairo in Egypt occupied the first, second, and third spots on the list, with AQI scores of 362, 289, and 210 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...