Bangladesh’s capital Dhaka on Tuesday morning ranked the 4th worst polluted city in the world in the Air Quality Index (AQI).   The air in Dhaka was categorised as ‘unhealthy for sensitive groups’ in the morning and the megacity had an AQI score of 101 at 09:08am.   When the AQI is between 101 and 150, members of sensitive groups may experience health effects. The general public is less likely to be affected in this condition.   Indonesia’s Jakarta, South Africa’s Johannesburg and India’s Delhi occupied the first three spots in the list of cities with worst air quality with AQI scores of 122, 117 and 113 respectively.