People walk past a street in heavy smog during a polluted day in Weifang, Shandong province, December 20, 2016. Picture taken December 20, 2016. REUTERS/Stringer ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA. TPX IMAGES OF THE DAY ORG XMIT: PEK04
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