International Relations (Security, Trade and Investment) , 国际关系（安全，贸易和投资）

Study: Pollution from Chinese factories is harming air quality on U.S. West Coast
Washington Post, January 21, 2014
www.washingtonpost.com/world/study-pollution-from-chinese-factories-is-harming-air-quality-on-us-west-coast/2014/01/21/225e9b1e-8281-11e3-bbe5-6a2a3141e3a9_story.html?tid=hpModule_04941f10-8a79-11e2-98d9-3012c1cd8d1e