Dhaka, Oct. 29 -- Dhaka's air quality remained in the 'unhealthy' zone on Wednesday morning.

With an Air Quality Index (AQI) score of 151 at 10:30 am, the capital ranked ninth among cities worldwide with the worst air quality. Pakistan's Lahore, India's Delhi, and China's Beijing occupied the top three spots, with AQI scores of 540, 253, and 206, 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 c...