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由於我國北方自上周末以來一直持續大霧天氣，有專家擔憂，空氣中含有的濃度較高的顆粒物很可能會導致包括肺部感染以及肺癌在內的多種呼吸道疾病。

Experts are worried that particulate matter in the air, which is in higher concentrations in North China because of the heavy fog since the weekend, may lead to various respiratory diseases including lung infections and cancer.