Dhaka, Dec. 26 -- Dhaka ranks second among cities worldwide with the worst air quality, recording an AQI of 260 at 9:55 am on Friday.

The city's air was classified as 'very unhealthy', posing serious health risks to residents, according to the Air Quality Index (AQI).

India's Delhi and Qatar's Doha occupied the first and third spots on the list, with AQI scores of 330 and 230, respectively.

When the AQI value for particle pollution is between 101 and 150, air quality is considered 'unhealthy for sensitive groups', between 150 and 200 is 'unhealthy', between 201 and 300 is said to be 'very unhealthy', while a reading of 301+ is considered 'hazardous', posing serious health risks to residents.

The AQI, an index for reporting daily air q...