The quality of Dhaka's air has shown rapid improvement.
Dhaka, which usually ranks among top 10 most polluted cities, dropped to 35th position with a score of 70 in the US Air Quality Index (AQI) at 9am on Saturday.
The air was classified as “moderate.”
Dhaka was ranked 6th with a score of 155 on Friday in the AQI, which was developed by the Environmental Protection Agency for reporting daily air quality of any city.
Brazil’s Sao Paulo and USA’s Los Angeles followed Dhaka with individual scores of 65 and 63 respectively, according to data obtained from mobile application AirVisual.
Saudi Arabia’s Riyadh ranked top among cities with worst air pollution with a score of 258.
Bangladesh, one of the most densely-populated countries in the world, has been struggling with air pollution for a long time. Its capital has been continuously ranked among the most polluted cities.
Brick kilns, vehicles run by fuels with higher level sulphur, as well as construction works have been identified as major sources of air pollution.
The air quality further declines during the dry months – from October to April – but improves in the monsoon.
The situation is very serious, experts say, pointing out that five of the top 10 causes of deaths in Bangladesh are related to air pollution.