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Air Quality Action Day? Worry Not, NYers!

Michael Animation, Data & Graphics, Photo, Video July 22, 2017

If you have never heard of an air quality action day, you are most likely a perfectly typical resident in the U.S. who is also lucky, the latter of which you may have been taking for granted. Because a hazy day like July 20, 2017 in Manhattan almost never happens. (Hazy is not the same as “foggy.”)

Manhattan skyline July 20 vs 21, 2017 seen from Queens

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NO2 & Air Pollution Tracking by NASA

Michael Animation, Data & Graphics, Photo, Video July 15, 2016

空气污染和二氧化氮的监测及趋势(2005 – 2014)

美国宇航局过去十年对全球195个城市的空气污染监测发现,欧美日本等地空气质量有所改善,但中国、印度及中东空气污染面积有所扩大。这里被监测的污染物是二氧化氮,主要来自汽车尾气、发电厂及工业活动的排放。二氧化氮可以很快变成地面层臭氧,是城市中雾霾的主要成分之一。如下图,中国的二氧化氮高浓度覆盖面积扩大最为明显(红色为浓度5000万亿分子/立方厘米):【点这里阅读英文原文

NO2 concentrations in Asia between 2005 and 2014, with the blue indicating 0 and the red indicating 5,000 trillion molecules per cubic centimeters (images: NASA)

NO2 concentrations in Asia between 2005 and 2014, with the blue indicating 0 and the red indicating 5,000 trillion molecules per cubic centimeters; China has witnessed an expansion of high NO2 pollution. [Images: NASA]

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