Dhaka, March 17 -- Dhaka, the densely populated capital of Bangladesh, ranked seventh among the world's most polluted cities on Tuesday morning, recording an Air Quality Index (AQI) of 146 at 08:29 am.

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

Riyadh in Saudi Arabia, Lahore in Pakistan, Beijing in China occupied the first, second, and third spots on the list, with AQI scores of 189, 189, and 182 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 se...