, Dec. 6 -- Dhaka, the overcrowded capital city of Bangladesh, has ranked the third on the list of cities with the worst air quality with an AQI score of 254 at 9:06 am this morning.

Today's air was classified as 'very unhealthy' and such air quality continued for the past few days, according to the AQI index.

Iraq's Bagdad and India's Delhi, occupied the first and second spots in the list, with AQI scores of 285 and 264, respectively.

When the AQI value for particle pollution is between 50 and 100, air quality is considered 'moderate', usually sensitive individuals should consider limiting prolonged outdoor exertion, between 101 and 150, air quality is considered 'unhealthy for sensitive groups', between 150 and 200 is 'unhealthy', be...