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DeSmogBlog
Nov 5, 2017, 10:55 am295 ptsBy Gunnar W. Schade, Texas A&M University Urban air pollution in the U.S. has been decreasing near continuously since the 1970s. Federal regulations, notably the Clean Air Act passed by President Nixon, to reduce toxic air pollutants such as benzene, a hydrocarbon, and ozone, a strong oxidant, effectively…
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