重点提示：（1）冷暖气团犬牙交错，南方降水持续； （2）华北周边持续污染，长江以南空气质量优良，呈现北高南低态势；
天气形势：
21日一股弱冷空气自黄土高原突入内陆腹地，早八时弱高压中心位于湖北西部，而东北、西南及东海上空仍受低压系统控制。受冷暖气团交汇影响，长江以南及东北地区大范围降水。
图1 2015年02月21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预报与实测结果空间分布略有偏差。观测显示污染中心仍位于首都周边的京津冀地区，东北及长江以南地区空气质量良好。
图2 2015年02月21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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