The densely populated capital of Bangladesh has once again topped the list of world cities with the worst air quality, reports UNB.

On Sunday, Dhaka’s Air Quality Index (AQI) was recorded at 254 at 10.36 am, and it was classified as ‘poor’ or ‘very unhealthy’.

China’s Shenyang and India’s Kolkata occupied the next two spots, with AQI scores of 197 and 188 respectively.

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.

AQI, an index for reporting daily air quality, is used by government agencies to inform people how clean or polluted the air of a certain city is, and what associated health effects might be a concern for them.

In Bangladesh, the AQI is based on five criteria pollutants — Particulate Matter (PM10 and PM2.5), NO2, CO, SO2 and Ozone.

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