The level of particles 2.5 micrometers or less in size was seven times the level deemed acceptable by the World Health Organization.
A spike in the level of pollutants in Tehran’s air has prompted officials to declare a red alert, and order schools closed.
On Sunday the level of particles 2.5 micrometers or less in size was seven times the level deemed acceptable by the World Health Organization.
The following images of air pollution in Tehran have been released by Tehran Picture Agency:
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