The authors thank Eric Zalewsky and John Irwin for their assistance with data analysis. The authors are grateful to Roland Draxler for his helpful comments on the manuscript. This research was performed within the framework of the Memorandum of Understanding between the U.S. Environmental Protection Agency and the U.S. Department of Commerce’s National Oceanic and Atmospheric Administration under Agreement DW13921548, and constitutes a contribution to the NOAA Air Quality Program. Although it has been reviewed and approved for publication by EPA and NOAA, it does not necessarily reflect their views or policies.
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