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People do morning exercise in sandstorm at Wanchun Pavilion under Jingshan Park in Beijing, capital of China, May 4, 2017. A sandstorm swept over much of north China including Beijing on Thursday, turning the sky yellow and obscuring visibility. The city's meteorological center issued a blue alert for sandstorms Thursday morning, forecasting winds to carry sand and dust across the capital. (Xinhua/Shen Bohan)