Officials today ordered offices and schools closed on Saturday in Tehran, adding a third day to weekend holiday of Thursday and Friday. The move was in reaction to the pollution levels reaching "dangerous levels" in the city.
The city of Isfahan is also experiencing "emergency levels" of air pollution and the residents were urged to leave town if possible.
Top photo: Polluted Tehran, Thursday 3 january 2012 (IRNA)
Bottom file photo: Isfahan grapples with air pollution (Mehr News Agency)