efe-epaIslamabad

The Pakistani city of Lahore closed schools on Thursday after an alarming rise in air pollution that made it the world's most polluted city for a few hours, covered by a dark toxic cloud.

“Due to sudden increase in smog, all schools in Lahore will remain closed," Usman Buzdar, the head of the government of Punjab province - whose capital is Lahore - said on his Twitter account shortly before midnight. EFE-EPA