The quality of the capital’s air has hardly improved over the past weeks when Dhaka was put under heavy restrictions with the rest of the country to curb the spread of coronavirus.   Dhaka’s air was ranked worst in the Air Quality Index (AQI) on Thursday morning. It had an AQI score of 233 at 8:35m and the air was classified as ‘very unhealthy’.   Bangladesh’s overcrowded capital is no stranger to polluted air and people expected it to improve, like other parts of the world, after the country entered a lockdown mode in late March.