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Dhaka once again has topped the list of the most polluted cities in the world as the city’s air quality was marked very unhealthy by Air Quality Index (AQI).
The capital's Air Quality Index (AQI) score was recorded at 248 at 9:00am on Monday.
Dhaka is followed by Lahore and war-torn Kyiv as they occupied the next two spots with an AQI index of 222 and 168 respectively.
An AQI score between 101 and 200 is considered 'unhealthy', particularly for sensitive groups.
Similarly, an AQI between 201 and 300 is said to be poor, while, 301 to 400 is considered to be hazardous that causes serious health risks to residents.
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.
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 during winter and improves during monsoon.
A report by the Department of Environment (DoE) 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 winter, the city’s air quality starts deteriorating sharply due to the massive discharge of pollutant particles from construction works, rundown roads, brick kilns and other sources.
Air pollution consistently ranks among the top risk factors for death and disability worldwide.
Breathing polluted air has been recognised as a factor that increases a person’s chances of developing heart disease, chronic respiratory diseases, lung infections and cancer, according to several studies.
As per the World Health Organization (WHO), air pollution kills an estimated seven million people worldwide every year, largely as a result of increased mortality from stroke, heart disease, chronic obstructive pulmonary disease, lung cancer and acute respiratory infections.
