Reducing surface ozone (O 3 ) to concentrations in compliance with the national air quality standard has proven to be challenging, despite tighter controls on O 3 precursor emissions over the past few decades. New evidence indicates that isoprene emissions changed considerably from the mid-1980s to the mid-1990s owing to land-use changes in the eastern United States (Purves et al., 2004). Over this period, U.S. anthropogenic VOC (AVOC) emissions decreased substantially. Here we apply two chemical transpo…
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