Bashundhara and Baridhara showed AQI scores of 299 and 276 respectively
Dhaka has been ranked as the worst in air pollution across all major cities of the world.
According to Air Visual on Thursday night, Dhaka showed an average AQI (Air Quality Index) score of 247, classified as "very unhealthy."
However, some parts of the city showed higher AQI score than the city average. Residential areas like Bashundhara and Baridhara showed AQI scores of 299 and 276 respectively.
When the AQI value is between 201 and 300, a city dweller is more likely to be affected and people with respiratory diseases are advised to limit outdoor activities.
The AQI, an index for reporting daily air quality, informs people how clean or polluted the air of a certain city is, and what associated health effects might be a concern for them.
In Bangladesh, the AQI is based on five criteria pollutants -- Particulate Matter (PM10 and PM2.5), NO2, CO, SO2, and Ozone (O3).
The Department of Environment has also set national ambient air quality standards for these pollutants. These standards aim to protect against adverse human health impacts.
Dhaka has long been grappling with air pollution. Its air quality usually improves during monsoon.