Terahertz assessment of the atmospheric pollution during the first-ever red alert period in Beijing
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摘要:
Haze or smog episodes,which are characterized by the presence of particulate matter at diameters less than 2.5 μm (PM2.5),have attracted increasing attention during the past few decades [1].PM2.5 has adverse effects on human respiratory health as well as on air visibility [2,3].In the Beijing-Tianjin-Hebei (BTH) region of China,haze has become especially serious in recent years because of industrial expansion and traffic-related emissions [4,5] (http://news.xinhuanet.com/english/2016-01/07/c_ 134987525.htm;http://news.cenews.com.cn/html/2016-01/07/content 38614.htm).