It had an AQI score of 263 on Saturday at 08:31pm
Dhaka, the capital of Bangladesh, has topped the list of cities with worst air quality.
It had an AQI score of 263 on Saturday at 08:31pm. The air was classified as " very unhealthy".
Mongolia's Ulaanbaatar and India's Mumbai occupied the second and third spots in the list of cities with the worst air quality with AQI scores of 247 and 171 respectively.
When the AQI value is between 201 and 300, everyone will noticeably feel the effect of fine particulate matter in the polluted air while the sensitive groups will experience reduced endurance in 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. The capital's air quality usually improves during monsoon.