自由亚洲电台: 北京首次启动最严重的空气污染蓝色预警

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北京首次启动最严重的空气污染蓝色预警 Oct 28th 2013, 18:45 10月28日，北京出现继国庆假期过后最为明显的雾霾天气，多地空气质量再次达到严重污染级别。北京市环保局工作人员表示，北京已首次启动空气重污染应急预案蓝色预警。 27日下午起，北京再度出现雾霾，北京市气象台于当天下午发布霾黄色预警信号。28日污染程度逐步加重，能见度和空气质量均不佳 28日北京各地区PM2.5浓度维持重度污染水平，提醒民众缩短户外停留时间，易感人群尽量避免外出。29日夜间空气质量将有明显改善。

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