Since no ozone modeling was performed for the Western U.S., future ozone nonattainment in the West was determined through an emissions scaling analysis that used forecast changes in NOx emissions in the West coupled with the response of ozone to emissions changes, as modeled in the East.
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The ozone modeling for the Western U.S. is based on the emissions changes responses in the East.
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There has been no possible way to determine future ozone nonattainment in the West.