The city has been ranked worst again on the AQI
Bangladesh’s capital, Dhaka, has ranked worst again on the world Air Quality Index (AQI) — as its extreme air pollution makes it one of the most polluted cities.
On the real-time rankings, Dhaka scored 339 at 7:54am on Sunday, according to AirVisual, which monitors global air quality.
Dhaka's air quality was classified as “hazardous.”
China’s Beijing and Kuwait’s Kuwait city occupied the second and third spots in the list of cities with the worst air quality with AQI scores of 176 and 164 respectively.
When the AQI value is more than 301, it is a health warning of emergency conditions and everyone is likely to be affected.
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.
As one of the most densely populated countries in the world, Bangladesh has been struggling with air pollution for a long time. Dhaka continuously ranks among the world’s most polluted cities.
Brick kilns, vehicles run on fuel containing higher levels sulphur, as well as construction work, have all been identified as major sources of air pollution.
Air quality further declines during the dry months—from October to April—but improves during the monsoon.