Browsing FAS Scholarly Articles by Keyword "hemispheric pollution"
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Variability in surface ozone background over the United States: Implications for air quality policy
(Wiley-Blackwell, 2003)The U.S. Environmental Protection Agency (EPA) presently uses a 40 ppbv background O3 level as a baseline in its O3 risk assessments. This background is defined as those concentrations that would exist in the absence of ...