Dhaka, April 24 -- Dhaka, the densely populated capital of Bangladesh, ranked seventh among the world's most polluted cities on Friday morning, recording an Air Quality Index (AQI) of 117 at 9:10 am.

According to the AQI scale, the air quality was classified as "unhealthy for sensitive groups," indicating potential health risks for vulnerable individuals.

Nepal's Kathmandu, India's Delhi, and Thailand's Chiang Mai topped the list of most polluted cities, with AQI scores of 235, 231, and 165, respectively.

An AQI reading between 101 and 150 is considered "unhealthy for sensitive groups," while 151-200 is deemed "unhealthy." Levels between 201 and 300 are classified as "very unhealthy," and readings above 301 are considered "hazardous," ...