2015年4月21日，全国空气质量态势良好。北方部分地区主要是华北和辽东受浮尘影响出现PM10污染，少数城市以PM2.5污染为主。南方部分地区主要是江浙一带出现臭氧污染。青海海西州继续臭氧污染。南疆浮尘污染继续，阿克苏重回PM2.5重度污染。MODIS卫星图片（1：30PM) 上，境外生物质燃烧烟雾继续影响我内蒙和东北部分地区。
中国环境监测总站城市日报截图：2015年4月21日
NASA TERRA 2015年4月21日10:30AM真彩图片，来自NASA Worldview.
NASA AQUA 2015年4月21日1:30PM真彩图片，来自NASA Worldview.
NASA AQUA 2015年4月21日1:30PM真彩图片，东北地区放大,来自NASA Worldview.
NASA AQUA 2015年4月21日1:30PM真彩图片并显示火点，东北地区放大。
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