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We use a global chemical transport model (GEOS-Chem) with 1°×1° horizontal resolution to quantify the effects of anthropogenic emissions from Canada, Mexico, and outside North America on daily maximum 8-hour average ozone concentrations in US surface air. Simulations for summer 2001 indicate mean North American and US background concentrations of 26±8ppb and 30±8ppb, as obtained by eliminating anthropogenic...
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