Air Quality Index

Dhaka air ‘hazardous’

Staff Correspondent

13 February, 2021 12:00 AM printer

Dhaka was ranked the second worst in air quality index in the world on Friday. 

The densely populated capital of Bangladesh continues to dominate the list of world cities with the worst air quality.

Air quality index (AQI) of Dhaka city at 9:00am on Friday was 312, which is considered “hazardous”.

Dhaka occupied the second position in the list of AQI during the time while the city of Delhi in neighbouring India was ranked the first.

The third and the fourth places were grabbed by Lahore of Pakistan and Beijing of China respectively.

An AQI between 201 and 300 is considered “poor”, while a reading of 301 to 400 is “hazardous”, posing serious health risks to city 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 overall AQI is based on five criteria pollutants – Particulate Matter (PM10 and PM2.5), NO2, CO, SO2, and Ozone (O3).

Bangladesh has a subtropical monsoon climate characterised by wide seasonal variations in rainfall, high temperatures and humidity. Generally, Dhaka’s air starts getting fresh when monsoon rains begin in mid-June.