Air Quality Index

Dhaka ranks second most polluted city

Staff Correspondent

30 January, 2021 12:00 AM printer

Dhaka ranked the second worst for air quality in the world, according to Air Quality Index (AQI) on Friday.

Kolkata in neighbouring India occupied the first place of mostly polluted city while third and fourth spots were grabbed by Karachi and Lahore of Pakistan.

Dhaka's air quality index (AQI) at 10.27 am read 289, which is considered 'poor' that is 'very unhealthy'. An AQI between 201 and 300 is considered 'poor', while a reading of 301 to 400 is said to be 'hazardous', posing serious health risks to city residents.

Urban expert and environmentalists say that due to massive development works and non-compliance of environmental issues cause the rise in the air quality degradation.

Amid Covid-19 pandemic the air quality degradation has become a serious cause of concern for residents.

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.