Dhaka: Bangladesh’s capital was ranked worst in the Air Quality Index (AQI) on Wednesday. Dhaka had a score of 179 at 10:50am, indicating that the air quality was unhealthy, reports the UNB. A numerical value between 151 and 200 indicates that everyone may begin to experience health effects. Members of sensitive groups may experience more serious health effects. India’s Delhi, Vietnam’s Hanoi, and Poland’s Krakow occupied the next three slots with scores of 174, 173 and 169 respectively. Air quality between 201 and 300 is classified as ‘very unhealthy’. If the score is between 301 and 500, then it is classified as ‘hazardous’. The AQI, an index for reporting daily air quality, tells people how clean or polluted the air of a certain city is, and what associated health effects might be a concern for them. Dhaka, one of the most densely populated cities in the world, has been grappling with air pollution for a long time. The air quality generally worsens during summer and shows signs of improvement in monsoon when the dust settles.