Mar 31, Kathmandu- Today, Kathmandu is ranked number one in the world's most polluted cities.
According to the Air Quality Index (AQI), Kathmandu's Air Quality Index (AQI) is 239.
An index between 151 and 300 is considered unhealthy.
Similarly, Delhi, India, is in second place, Chiang Mai, Thailand, is in third place, and Dhaka, Bangladesh, is in fourth place.