Changes in Ozone Chemical Sensitivity in the United States from 2007 to 2016.

Each of these sites (located on the map in Figure 7 ) showed a trend toward NO x -limitation (i.e., a relative shift toward more negative differences) going from 2007 to 2016 in both monitoring and modeled data as well as the associated O 3 isopleths (see Figures S5–S12 and S29–33 ), although the trends were not as pronounced as those for the two downwind monitors mentioned above.

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