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We analyze background surface ozone (O 3 ) concentrations as estimated by coupled GEOS-Chem/CAMx models for 23 monitoring sites across the US at high- and low-elevation, rural and urban locations during 2006. Specifically, we consider hourly contributions from global tropospheric O 3 entering North America, stratospheric O 3 over North America, and natural O 3 formed...
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