Despite rain, Dhaka's air quality continued to be in the 'unhealthy' zone this morning.

With an air quality index (AQI) score of 157 at 9:04 am, Dhaka ranked 11th on the list of cities worldwide with the worst air quality.

Pakistan’s Lahore, India’s Delhi and Qatar’s Doha occupied the first three spots on the list, with AQI scores of 211, 176 and 173, respectively.

Dhaka’s air quality 3rd worst in the world this morning

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

Dhaka's air quality worst in the world this morning

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.

Dhaka’s air quality 4th worst in the world this morning

As per the World Health Organization (WHO), air pollution kills an estimated seven million people worldwide every year.