According to the index, the air quality in major cities like the capital Tehran, Karaj, Tabriz, Arak and Ahvaz is considered “unhealthy for sensitive groups” and unhealthy for all groups in Hamedan, Sepehrnia said, IRNA reported.

Air pollution will increase in the coming days in Tehran, IRNA quoted an official of the country’s meteorological organization as saying.

During the week, the government closed all schools in Tehran and adjacent regions till Sunday due to heavy smog. A brief rain cleared the air somewhat, but the new warning indicates the serious health hazard will not end soon.

The meteorological expert told IRNA that most of the country will experience calm atmospheric conditions in the coming week, which will contribute to rising air pollution, as particles will accumulate instead of getting dispersed by wind or rain.

Many Iranian cities suffer from a variety of pollution and smog problems, some due to natural phenomena, such as heavy sandstorms mixed with dangerous particles, or purely manmade reasons.

Tehran’s mayor spoke of plans to evacuate the population if pollution reaches highly dangerous levels.

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According to the Tehran Air Quality Control Company the amount shows a two-day increase compared to the last year (March 2017-March 2018).

So far since the beginning of the current year Tehraners have experienced 203 days of good air quality and 32 days of poor air quality for sensitive groups, the reported added.

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