Dhaka's air quality was in the unhealthy zone on Sunday morning.
With an air quality index (AQI) score of 107 at 8:35am, the capital of Bangladesh ranked sixth on the list of cities worldwide with the worst air quality.
Indonesia's Jakarta, Pakistan's Lahore and Brazil's Sao Paulo occupied the first three spots on the list, with AQI scores of 168, 138 and 124, respectively.
When the AQI value for particle pollution is between 101 and 150, air quality is considered unhealthy for sensitive groups, between 151 and 200 is unhealthy, between 201 and 300 is said to be very unhealthy, while a reading of 301+ is considered hazardous, posing serious health risks to residents.
In Bangladesh, the AQI is based on five criteria pollutants — particulate matter (PM10 and PM2.5), NO2, CO, SO2 and ozone.
Dhaka has long been grappling with air pollution issues. Its air quality usually turns unhealthy in the winter and improves during the monsoon.