Dhaka, March 4 -- Dhaka, the densely populated capital of Bangladesh, ranked first among the world's most polluted cities on Wednesday morning, recording an Air Quality Index (AQI) of 315 at 08:53 am.

Today, the city's air was classified as 'Hazardous', indicating a severe health risks, according to the AQI report.

Lahore in Pakistan, Kolkata in India and Beijing in China occupied the second, third, and fourth spots on the list, with AQI scores of 237, 197, and 183 respectively.

Batam in Indonesia recorded the world's cleanest air, with an AQI score of 0.

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 ...