Dhaka’s air quality remains ‘unhealthy’
Dhaka's air quality continues to be "unhealthy", but the densely populated capital of Bangladesh is no longer the world's most polluted city.
With an air quality index (AQI) reading at 176 at 9:14am, the capital has slipped to the third position in the latest list of world cities with the worst air quality.
Pakistan's Lahore and India's Delhi occupied the first two spots, with AQI scores of 190 and 182, respectively.
An AQI between 101 and 200 is considered "unhealthy". Similarly, an AQI between 201 and 300 is said to be "poor", while a reading of 301 to 400 is considered "hazardous", posing serious health risks.
AQI, an index for reporting daily air quality, is used by government agencies to inform 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.
Dhaka has long been grappling with air pollution issues. Its air quality usually turns unhealthy in winter and improves during the monsoon.
A report by the Department of Environment and the World Bank in March 2019 pointed out that the three main sources of air pollution in Dhaka "are brick kilns, fumes from vehicles and dust from construction sites".
With the advent of winter, the city's air quality starts deteriorating sharply due to the massive discharge of pollutant particles from construction work, rundown roads, brick kilns and other sources.