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http://www.nasa.gov/topics/earth/features/health-sapping.html * K2 F% ?1 g8 } New Map Offers a Global View of Health-Sapping Air Pollution09.22.10 In many developing countries, the absence of surface-based air pollution sensors makes it difficult, and in some cases impossible, to get even a rough estimate of the abundance of a subcategory of airborne particles that epidemiologists suspect contributes to millions of premature deaths each year. The problematic particles, called fine particulate matter (PM2.5), are 2.5 micrometers or less in diameter, about a tenth the fraction of human hair. These small particles can get past the body’s normal defenses and penetrate deep into the lungs.8 {1 } d) _3 m; R) J; U To fill in these gaps in surface-based PM2.5 measurements, experts look toward satellites to provide a global perspective. Yet, satellite instruments have generally struggled to achieve accurate measurements of the particles in near-surface air. The problem: Most satellite instruments can't distinguish particles close to the ground from those high in the atmosphere. In addition, clouds tend to obscure the view. And bright land surfaces, such as snow, desert sand, and those found in certain urban areas can mar measurements./ F- `8 x/ i' V; L$ L# e: g$ K* w : S1 B* j" o* M: C" K However, the view got a bit clearer this summer with the publication of the first long-term global map of PM2.5 in a recent issue of Environmental Health Perspectives. Canadian researchers Aaron van Donkelaar and Randall Martin at Dalhousie University, Halifax, Nova Scotia, Canada, created the map by blending total-column aerosol amount measurements from two NASA satellite instruments with information about the vertical distribution of aerosols from a computer model. .......... ....... .... |
哈哈!除了水行业,将来还会有气行业了! 不过这些技术只能自己研发了,老外不需要。 |
回楼上的,现在已经有了,家居和中央空调一起安装的,叫清风系统,说白了就是装个过滤器,等于把经过房间的空气全部过滤过了。哎,以后要是普及起来真是悲剧啊! |
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