Lahore, which is engulfed in thick haze, has been named the world's most polluting city for the third day in a row, surpassing New Delhi on the list of most polluted cities.
Lahore received a score of 243 on the official Air Quality Index (AQI), whereas international monitoring groups gave it a score of 397.
With an AQI of 173, Karachi ranked fifth among the world's most polluted cities.
In the list of most polluted cities in the world, Mongolian city Ulaanbaatar came in second with 175 AQI (Particulate Matter (PM) 2.5, Indian city Kolkata came in third, and Delhi came in fourth with 175 AQI (Particulate Matter (PM) 2.5.
