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日本研究结果：地铁PM2.5是路面5倍

2019-01-17 08:30:02    环球时报

在雾霾天，很多人走进地铁会下意识地摘掉口罩。但日本庆应义塾大学的最新研究成果却显示，地铁中的PM2.5浓度更高，相当于地上大气中的5倍，更易对人体造成危害。

据日本《读卖新闻》16日报道，研究人员从去年7月开始在横滨市内的地铁内测量PM2.5浓度。结果显示，8时至10时的“早高峰”期间，地铁内空气PM2.5含量达到100微克，大约是同期地面空气浓度的5倍。并且，铁浓度达到地上空气的230倍，钛，铜，锌等金属的浓度也较高。由此，研究团队认为，这可能是由于列车刹车时，车闸、车轮与轨道摩擦产生金属微粒所致。(孙秀萍)

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