桑拿天笼罩下的北京城，不仅闷热潮湿，连空气污染也过来“捣乱”。记者从环保部门了解到，今天上午城区及南部地区一度出现中度到重度污染，首要污染物为细颗粒物PM2.5。北京市环保监测中心表示，下午随着垂直扩散条 ...
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