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Beijing's air pollution reached dangerous levels yet again on Sunday, marking the third consecutive day of severe smog, municipal environmental authorities said. 北京市环保部门称，北京空气污染在上周日再次达到危险的水平。持续三天的严重雾霾天气给北京带来了严重的空气污染。 The municipal meteorological station issued the city's first orange fog warning Sunday morning due to decreased visibility caused by the heavy smog. Monitoring data released on Sunday showed that air quality indexes in most regions of Beijing had hit 500, the indexes' highest level. 北京市环保部门在周日上午发布了北京气象史上首个霾橙色预警，浓雾笼罩的北京市能见度非常低。周日发布的监控数据显示，北京大部分地区的空气质量指数均达到了极值500. | 
