Monday, 6 February, 2023

Dhaka tops bad AQI

Residents of Dhaka have been experiencing a much poorer quality of air in the capital since the onset of winter after a favourable autumn, reports

The drastic drop in air quality is evident in the latest data published by the Air Quality Index, or AQI, on Sunday. Dhaka once again topped the list of cities with the worst air quality, surpassing China’s Shenyang and Chengdu, Vietnam’s Hanoi and India’s Kolkata.

The air pollution score was 271, which is described as 'very unhealthy'. The air quality depends on the particulate matter or PM10 and extra fine particulate matter or PM2.5 measured on a scale of parts per million.

Besides PM2.5 and PM10, sulphur dioxide, carbon monoxide, nitrogen dioxide, and air pollution in the ground-level ozone are considered while determining the air quality index. The higher the AQI score, the more hazardous the air becomes.                 The air quality in an area is considered 'good' when the AQI ranges from 0 to 50. When the AQI remains in the range of 51-100, the air quality is considered 'moderate'.