Dhaka, Feb. 18 -- The air was classified as "very unhealthy", referring to an alarming health risk to residents, according to the AQI index.
India's Delhi, Pakistan's Lahore and Nepal's Kathmandu cities occupied the second, third and fourth spots on the list, with AQI scores of 229, 197 and 191, respectively.
When the AQI value for particle pollution is between 50 and 100, air quality is considered "moderate", usually sensitive individuals should consider limiting prolonged outdoor exertion, 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 ...