Dhaka, Feb. 8 -- Dhaka ranked second on the list of cities with the worst air quality on Saturday morning.

The air was classified as "unhealthy" with an AQI score of 177 at 9:00 am, according to the AQI index, reports UNB.

Pakistan's Lahore, India's Delhi and Senegal's Dakar occupied the first, third and fourth spots on the list, with AQI scores of 217, 176 and 175 respectively.

When the AQI value for particle pollution is between 50 and 100, air quality is considered 'moderate', 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 considered 'hazardous', posing serious health risks to residents...