重点提示： （1）冷空气进一步南下，北方大气扩散条件好转，南方地区面临污染区域输送威胁； （2）污染带随冷空气南压，全国呈现南高北低的污染态势；
图1 2015年01月17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：
17日冷空气进一步南下扩散，早8时高压中心位于首都以北内蒙地区，前锋已过长江流域抵达华南地区。北方大片地区污染扩散条件好转。
图2 2015年01月17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预报较实测结果偏低，低估区域主要位于江淮流域以南，可能与区域污染输送有关。总体而言全国空气质量形势稍所缓解。
图3 2015年01月17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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