, Oct. 28 -- Dhaka's air quality continued to be in the 'unhealthy' zone on Tuesday morning.

With an air quality index (AQI) score of 191 at 9:04 am, Dhaka ranked 3rd in the list of cities around the world with the worst air quality.

Pakistan's Lahore and India's Delhi occupied the first and second spots, with AQI scores of 421 and 269, respectively.

When the AQI value for particle pollution is between 50 and 100, air quality is considered 'moderate', usually sensitive individuals should consider limiting prolonged outdoor exertion, 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...