An automobile cargo ship remains moored to a wharf under heavy smog and zero visibility in the Port of Dalian, in the port city of Dalian in Liaoning Province on May 4, 2017. A major dust storm is choking a large portion of northern China, in yet another air quality crisis to affect the country. Photo by Stephen Shaver/UPI <저작권자(c) 연합뉴스, 무단 전재-재배포 금지>