Heavy rainfall in Ahwaz on October 21 sent more that 1,000 citizens to hospital emergency rooms with respiratory complications.
While many of these people were treated in the ambulatory unit and released, all the hospitals in Ahwaz are now on alert to treat affected patients.
Last year Ahwaz experienced similar problems when acidic precipitation caused serious respiratory problems for the public.
Ahwaz air is heavily polluted due to the proximity to oil industry facilities.