2015年1月21日，东北地区污染加重至普遍中度至重度污染水平。山西全境、陕西大部出现今年以来少有的普遍良好空气质量。京、津和冀北，短暂好转，冀南、河南、山东东部维持轻度污染态势。两湖两广和四川盆地，灰霾不散，污染程度不输东北。华东地区再次沦陷，出现轻度至中度污染跨省市连片。MODIS卫星图片上，惊现我国南方地区大范围灰霾污染（局部大图），华东、华中、华南以及西南的灰霾几乎连片，沆瀣一气。
中国环境监测总站城市日报截图：2015年1月21日
NASA TERRA 2015年1月21日10:30AM真彩图片，来自NASA Worldview.
NASA AQUA 2015年1月21日1:30PM真彩图片，来自NASA Worldview.
NASA AQUA 2015年1月21日1:30PM真彩图片，南方地区局部放大，来自NASA Worldview.
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