Dhaka, the capital of Bangladesh, ranked 11th among the world’s most polluted cities on Thursday morning, with an Air Quality Index (AQI) score of 94.
According to the AQI scale, the city’s air quality was classified as ‘Moderate’ at 08:48am.
Indonesia’s Jakarta, Pakistan’s Lahore, and Chile’s Santiago were the three most polluted cities, with AQI scores of 173, 171 and 143 respectively.
An AQI between 101 and 150 is considered ‘unhealthy for sensitive groups’, while a score between 151 and 200 is classified as ‘unhealthy’. AQI readings between 201 and 300 are termed ‘very unhealthy’, and anything above 301 is considered ‘hazardous’, posing serious health risks.
The AQI is a daily indicator of air quality, showing how clean or polluted the air is and the possible health effects people may experience.
In Bangladesh, the AQI is calculated based on five major pollutants: particulate matter (PM10 and PM2.5), nitrogen dioxide, carbon monoxide, sulphur dioxide and ozone.
Dhaka has long struggled with severe air pollution. Air quality usually worsens during winter and improves in the monsoon season.
According to the World Health Organization, air pollution causes around seven million deaths globally each year, mainly from stroke, heart disease, chronic respiratory diseases, lung cancer and acute respiratory infections.