大气污染成为致癌原因
<p>在中国，城市笼罩在浓重雾霾里成了司空见惯的情景。2017年冬天，有关北京“空气末日”（<span word="airpocalypse">airpocalypse</span>）的报道占据了全球媒体的头条，在中国国内也引发了不满和争论。但在本周，中国东北部城市哈尔滨的大气污染状况则刷新了之前北京高污染水平的记录。</p><p>世界卫生组织的国际癌症研究机构将大气污染归为致癌物。据称，有“充分证据”证实，暴露在大气污染下的户外会导致肺癌，而且还会有增加患膀胱癌的风险。</p><p>中国雾霾已经广泛地成为呼吸道疾病的诱因，而且据新华社报道，医学专家发出警告称，在哈尔滨高危雾霾之后，需要相关疾病治疗的人数将会大增。</p><p><span word="Cityscapes">Cityscapes</span> <span word="shrouded">shrouded</span> <span word="in">in</span> <span word="thick">thick</span> <span word="smog">smog</span> <span word="have">have</span> <span word="become">become</span> <span word="a">a</span> <span word="common">common</span> <span word="scene">scene</span> <span word="in">in</span> <span word="China">China</span>. <span word="Last">Last</span> <span word="winter">winter</span>, <span word="Beijing">Beijing</span>'<span word="s">s</span> '<span word="airpocalypse">airpocalypse</span>' <span word="garnered">garnered</span> <span word="headlines">headlines</span> <span word="worldwide">worldwide</span> <span word="and">and</span> <span word="generated">generated</span> <span word="much">much</span> <span word="anger">anger</span> <span word="and">and</span> <span word="debate">debate</span> <span word="within">within</span> <span word="China">China</span>. <span word="But">But</span> <span word="this">this</span> <span word="week">week</span>, <span word="air">air</span> <span word="pollution">pollution</span> <span word="levels">levels</span> <span word="in">in</span> <span word="the">the</span> <span word="northeastern">northeastern</span> <span word="city">city</span> <span word="of">of</span> <span word="Harbin">Harbin</span> <span word="surpassed">surpassed</span> <span word="the">the</span> <span word="previous">previous</span> <span word="record">record</span> <span word="levels">levels</span> <span word="in">in</span> <span word="Beijing">Beijing</span>.</p>
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