Karachi has replaced Lahore as the most-polluted city in the world, reported 24NewsHD TV channel on Sunday.
The city has recorded a particulate matter rating of 235.
Lahore ranks second in the list of the most polluted cities in the world.
The city has recorded a particulate matter rating of 233.
Indian capital Delhi ranks third in the list of the most polluted cities in the world.
The city has recorded a particulate matter rating of 191.
It is to be noted here that a particulate matter rating above 301 indicates hazardous pollution.