16 ) show a decreasing trend from 2002 to 2017 due to decreasing emissions from onroad vehicles ( Fig. 17 ) and nonroad equipment.
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2002-2017 anthropogenic emissions data for air quality modeling over the United States.
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The sentences
NH 3 All three data sources show an increasing trend in NH 3 emissions from 2014 to 2017 ( Fig. 24 ).