, May 31 -- Dhaka ranked 13th among the world's most polluted cities on Sunday morning, recording an Air Quality Index (AQI) of 96 at 10:50am.

The air quality was classified as "moderate", indicating it may pose a mild risk for a very small number of unusually sensitive individuals, such as people with asthma or respiratory conditions, according to the AQI scale.

Johannesburg of South Africa, Kinshasa of the Democratic Republic of the Congo and Santiago of Chile occupied the first, second and third spots with AQI scores of 170, 161 and 156, respectively.

According to AQI standards, a reading between 101 and 150 is considered "unhealthy for sensitive groups", 151 and 200 "unhealthy", 201 and 300 "very unhealthy", while levels above 301 ...