, Dec. 30 -- Dhaka, the overcrowded capital city of Bangladesh, has ranked 30th on the list of cities with the worst air quality with an AQI score of 93 at 9:10am this morning.

Today's air was classified as 'moderate,' referring to a light health threat, according to the AQI index.

India's Delhi, China's Wuhan and India's Kolkata occupied the first three spots on the list, with AQI scores of 298, 188 and 183 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', between 201 and ...