Dhaka, Feb. 16 -- Dhaka has topped the list of cities worldwide with the worst air quality with an AQI of 239 on Friday morning.

The air was classified as "very unhealthy," according to the air quality index, reports UNB.

An AQI between 151 and 200 is considered "unhealthy" while 201-300 is "very unhealthy" and 301+ is considered "hazardous," posing severe health risks to residents.

Pakistan's Lahore, India's Delhi and Kolkata and Iraq's Baghdad occupied the second, third, fourth and fifth spots on the list, with AQI scores of 223, 219, 199 and 187 respectively.

The AQI, an index for reporting daily air quality, informs people how clean or polluted the air of a certain city is and what associated health effects might be a concern for ...