Bangladesh's capital has been ranked fourth worst in the Air Quality Index (AQI) on Thursday.
Dhaka had a score of 165 at 10:44am, indicating that the air quality was unhealthy.
A numerical value between 151 and 200 indicates that everyone may begin to experience health effects. Members of sensitive groups may experience more serious health effects.
India's Delhi, Pakistan's Lahore and Nepal's Kathmundu occupied the top three spots respectively, according to a UNB report.
The AQI, an index for reporting daily air quality, tells people how clean or polluted the air of a certain city is, and what associated health effects might be a concern for them.
Dhaka, one of the most densely populated cities in the world, has been grappling with air pollution for a long time. The air quality generally worsens during summer and shows signs of improvement in monsoon when the dust settles.
