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Construction workers are seen in heavy dust in Iran's Sarpol-e Zahab city on Oct. 27, 2018. Heavy sand storm engulfed some western cities of Iran on Saturday. (Xinhua/Ahmad Halabisaz)

Construction workers are seen in heavy dust in Iran's Sarpol-e Zahab city on Oct. 27, 2018. Heavy sand storm engulfed some western cities of Iran on Saturday. (Xinhua/Ahmad Halabisaz)