Dhaka, Oct. 9 -- Dhaka, the densely populated capital of Bangladesh, ranked fourth among cities with the poorest air quality this morning with an AQI score of 165 at 9:30 am.

This level, classified as 'unhealthy, poses a serious threat to public health, according to the AQI index.

Pakistan's Lahore, Bahrain's Manama and India's Kolkata occupied the first three spots on the list, with AQI scores of 182, 172 and 166, respectively.

An AQI between 50 and 100 is considered 'moderate' with acceptable air quality 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 300 is said to be...