重点提示： （1）北方低压系统节外生枝，南下冷空气后继乏力被迫东进，长江流域以南无缘新鲜空气； （2）全国城市空气污染延续南高北低的趋势，长江流域以南的污染带难以得到有效清除；
图1 2015年01月18日全国城市空气质量状况统计（数据来源：环保部数据中心）
天气形势：
18日北方冷高压中心附近有低压系统持续发展，迫使南下冷空气挥师东进。早8时有强低气压中心位于内蒙东部，华北地区盛行偏西风，而长江以南地区无冷空气光顾，仍有大片污染区域。
图2 2015年01月18日地面天气图（08:00 UTC+8）和污染气象预报图 (图片来源：中央气象台)
预报回顾：
当日矮马全国AQI预报仍较预报结果偏低，长江以南污染带在实测结果中清晰可见。预计未来在北方冷空气恢复南下扩散路径后该污染带才会得到有效清除。
图3 2015年01月18日AQI空气质量预报与实况比较（左：矮马预报；右：CNEMC数据平台）
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