In this photo released by Xinhua News Agency, rescue workers gauge the density of carbon monoxide in the smog at the entrance of the coal mine in Yongchuan District of Chongqing, southwestern China, Friday, Dec. 4, 2020. China's state TV says more than a dozen coal miners have been killed by high levels of carbon monoxide in the country's southwest. (Huang Wei/Xinhua via AP)
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