Saturday, 10 December, 2022
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Dhaka’s air ‘unhealthy’

Dhaka’s air  ‘unhealthy’

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Dhaka is no longer the world's most polluted city, but its air quality still remains in the 'unhealthy for sensitive groups' zone, reports UNB.

With an air quality index (AQI) score of 168 at 8.40am on Thursday, the metropolis ranked third in the list of world cities with the worst air quality.

Pakistan’s Lahore and India’s Kolkata occupied the first two spots, with AQI scores of 196 and 170, respectively.

An AQI between 101 and 200 is considered 'unhealthy', particularly for sensitive groups.

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 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, 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.

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.