Karachi's air quality index (AQI) touched 224, as per the latest list of world cities with the worst air quality.

Dhaka city in Bangladesh remained the second most populated city with AQI of 302.

Russia’s Krasnoyarsk stood at the top of the list with 307  AQI recorded.

An AQI above 300 is considered hazardous for everyone and doctors advise people to avoid all outdoor activities, reports Dhaka Tribune.