TEHRAN Ė The Iranian government ordered on Sunday the temporary closure of primary schools and nurseries in the capital Tehran due to the rising level of air pollution.
The Tehran City Council also ordered the suspension of all construction activities where sand, asphalt and cement were used.
The authorities said the high concentrations of smog came as a result of an increase in the density of suspended particles that were less than 2.5 micrometers in size, in addition to the lack of wind and rain.
Elderly people were also urged to stay indoors.
According to Iranís Air Quality Control Company, the air pollution index reached 145 micrograms per cubic meter in the past 24 hours.
Figures calculated by the Iranian Ministry of Health, showed a total of 4,810 people had died in Tehran as a result of air pollution in the previous Iranian calendar year, which ended on March 21, 2017.