Besides, Dhaka ranked the 2nd most polluted city for the year as arranged by average annual PM2.5 concentration after New Delhi.
As per the IQAir AirVisual's 2019 World Air Quality Report, Bangladesh had particulate matter 2.5 (PM2.5) 83.30 μg/m3 on average. The air was categorised as ‘unhealthy’.
Pakistan, Mongolia, Afghanistan and India occupied the second, third, fourth and fifth positions respectively.
Of them, Pakistan and Mongolia’s air conditions deteriorated while the rest three illustrated slight improvements between the years of 2018 and 2019.
The five countries with best air quality are Bahamas, US Virgin Islands, Iceland, Finland and Estonia with average PM 2.5 of 3.30 μg/m3, 3.53, 5.55, 5.63 and 6.15 μg/m3 respectively.
The 2019 World Air Quality Report is based on data from the world’s largest centralised platform for real-time air quality data, combining efforts from thousands of initiatives run by citizens, communities, companies, non-profit
organisations and governments.
It includes only PM2.5 (fine particulate matter) data as acquired from ground-based air quality monitoring stations with high data availability.
To track outdoor air quality, the report focused on the concentrations of two pollutants in particular: fine particle air pollution (particulate matter measuring less than 2.5 micrometers in aerodynamic diameter, or PM2.5) and ozone found near ground level (tropospheric ozone).
This assessment also tracked exposure to household air pollution from burning fuels such as coal, wood, or biomass for cooking.
Air pollution consistently ranks among the top risk factors for death and disability worldwide. Breathing polluted air has long been recognized as increasing a person’s chances of developing heart disease, chronic respiratory diseases, lung infections, and cancer, according to the report.
As per the World Health Organization (WHO), the 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.
Over 80 percent living in urban areas which monitor air pollution are exposed to air quality levels that exceed WHO guideline limits, with low- and middle-income countries most at risk, WHO estimated.
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