Dhaka, Dec. 14 -- Dhaka, the overcrowded capital city of Bangladesh, has ranked ninth on the list of cities with the worst air quality with an AQI score of 165 at 9:09 am.Dhaka's air was classified as 'unhealthy' referring to an alarming threat, according to the AQI index.India's Delhi, Pakistan's Lahore and India's Kolkata occupied the first, second and third spots on the list, with AQI scores of 577, 317, and 263 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 a...