Kathmandu ranks top on list of worst AQI cities in world

Kathmandu ranks top on list of worst AQI cities in world. Since the past few days, Kathmandu has continued to retain its position of most polluted city in the world. As per the reading by IQ Air, a Swiss group that collects real-time air-quality data around the globe, the particulate matter pollution (PM2.5) levels of Kathmandu at 8 am (local time) stood at 241 micrograms per cubic metre. It further climbed to 258 by 10 am (local time) with the start of office time in the national capital.