Dhaka's air quality has turned 'moderate' during Eid-ul-Fitr holidays as most of the residents left the capital for their respective villages to celebrate the religious festival.

With an air quality index (AQI) score of 91 at 10:46am, Dhaka today ranked 17th 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 a very small number of people who are unusually sensitive to air pollution.

Nepal's Kathmandu, the United Arab Emirates' Dubai and Myanmar's Yangon occupied the first three spots in the list, with AQI scores of 170, 160, and 140, 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 Organisation (WHO), air pollution kills an estimated seven million people worldwide every year, largely as a result of increased mortality from stroke, heart disease, chronic obstructive pulmonary disease, lung cancer, and acute respiratory infections.