Dhaka, Oct. 20 -- Dhaka ranked 7th among the world's most polluted cities on Tuesday morning, recording an Air Quality Index (AQI) score of 167 at 10:35 am.

The air quality was classified as 'unhealthy', meaning the concentration of pollutants in the air had reached a level that could pose health risks to the general population, according to the AQI scale.

Lahore in Pakistan ranked first with an AQI score of 201, while Delhi in India ranked second with a score of 199, followed by Mumbai in India fourth place with an AQI score of 189.

According to AQI standards, a reading between 101 and 150 is considered 'unhealthy for sensitive groups', while 151 to 200 is classified as 'unhealthy'. A reading between 201 and 300 is considered 'very un...