Bangladesh's capital was ranked third worst in Air Quality Index (AQI) on Monday morning.
Dhaka had a score of 169 at 8:30am, which means the city's air quality was classified as unhealthy.
Pakistan's Lahore and India's Delhi were at the top of the list with scores of 211 and 195 respectively.
When the AQI value is between 151 and 200, every city dweller may begin to experience health effects. Members of sensitive groups may experience more serious health effects in this situation.
Active children and adults, and people with respiratory disease, such as asthma, are advised to avoid prolonged outdoor exertion.
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.
Bangladesh's overcrowded capital has been grappling with air pollution for a long time. The quality usually improves during monsoon.