Dhaka's air quality remained in the unhealthy category on Friday morning, with an Air Quality Index (AQI) score of 153 at 9:10am.
With this score, the capital ranked 12th among the world's most polluted cities.
Pakistan's Lahore, India's Delhi and Senegal's Dakar occupied the top three positions, recording AQI scores of 344, 244 and 184, respectively.
On Thursday, Dhaka ranked seventh among the world's most polluted cities at 9:20am, with an AQI score of 165.
An AQI score of 50 or below indicates good air quality, while a score between 51 and 100 is considered moderate. Scores between 101 and 150 are classified as unhealthy for sensitive groups, while readings from 151 to 200 fall into the unhealthy category.
AQI readings between 201 and 300 are considered very unhealthy, while scores above 300 are classified as hazardous and pose serious health risks.
The AQI is a daily indicator of air quality that measures how clean or polluted the air is and indicates the potential health effects people may experience.
In Bangladesh, the AQI is calculated based on five major pollutants: particulate matter (PM10 and PM2.5), nitrogen dioxide, carbon monoxide, sulphur dioxide and ozone.