Dhaka's air quality turns 'moderate' on Friday morning

Air pollution in a street of capital Dhaka

Dhaka, Sept 23  -- Dhaka's air quality has turned ‘moderate’ on Friday morning. With an air quality index (AQI) score of 74 at 9am, the metropolis on Friday ranked 23rd in the list of world cities with the worst air quality.

An AQI between 50 and 100 is considered ‘moderate’ with an acceptable air quality. However, there may be a moderate health concern for people who are sensitive to air pollution.

South Africa’s Johannesburg, China’s Wuhan and Pakistan’s Lahore occupied the first three spots in the list, with AQI scores of 163, 155 and 139, 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.

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.

Air pollution consistently ranks among the top risk factors for death and disability worldwide. Breathing polluted air has long been recognised as increasing a person’s chances of developing a heart disease, chronic respiratory diseases, lung infections and cancer, according to several studies.

As per the World Health Organization (WHO), air pollution kills an estimated