, Jan. 3 -- Dhaka, the overcrowded capital city of Bangladesh, has ranked eighth on the list of cities with the worst air quality with an AQI score of 163 at 9:15 am this morning.

The capital's air was classified as 'unhealthy', according to the AQI index.

Afghanistan's Kabul and India's Kolkata and Delhi and Egypt's Cairo occupied the first, second, third and fourth spots on the list, with AQI scores of 429, 244, 235 and 179 respectively.

'Unhealthy' air quality persists in Dhaka

An AQI score between 50 and 100 is considered 'moderate', usually prompting sensitive individuals to limit prolonged outdoor exertion. A score between 101 and 150 is considered 'unhealthy for sensitive groups', 150 to 200 is 'unhealthy', 201 to 300 is 'very ...