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He said that without intervention, PM2.5, a major cause of choking smog, would replace smoking tobacco as the top risk factor for lung cancer. 他表示，如果不採取任何措施的話，造成令人窒息的濃霧的主要因素之一——PM2.5將會取代吸菸，成爲誘發肺癌的首要因素。