Dhaka, Nov. 2 -- Dhaka ranked fourth among cities with the worst air quality in the world on Monday morning, recording an Air Quality Index (AQI) score of 165 at 10:20am.

The city's air quality was classified as 'unhealthy', according to the global air quality and pollution ranking.

Pakistan's Lahore topped the list with an AQI score of 535, followed by India's Delhi with 199 and Egypt's Cairo with 186.

An AQI between 151 and 200 is considered 'unhealthy' while 201-300 is 'very unhealthy' and 301-400 is considered 'hazardous', posing severe health risks to residents.

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...