Air pollution forecast in Tehran for the next two days The General Directorate of Meteorology of Tehran warned of an increase in atmospheric pollutants, especially suspended particles smaller than 2.5 microns, in the next two days (October 21 and 14) in the province.

Air pollution forecast in Tehran for the next two days The General Directorate of Meteorology of Tehran warned of an increase in atmospheric pollutants, especially suspended particles smaller than 2.5 microns, in the next two days (October 21 and 14) in the province.