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It is well recognized that the NOX (NO + NO2) emission has been reduced steadily in the United States, but NH3 emission is increasing strongly without regulation. Li et al. (1) estimate the NH3 dry deposition by using the multilayer model (MLM) and bidirectional approaches, and conclude that the control policy for NOX emission has now shifted the total (wet + dry) nitrogen deposition in the United States from the oxidized nitrogen-dominated to the reduced nitrogen-dominated pattern. The authors further conclude that the NH3 dry deposition alone could contribute more than 50% to the total nitrogen deposition in some regions in the United States.Although Li et al. (1) mention the effect of organic nitrogen compounds, they do not include it in their study. Previous studies … [↵][1]1To whom correspondence should be addressed. Email: jsfu{at}utk.edu. [1]: #xref-corresp-1-1

Organic nitrates and other oxidized nitrogen compounds contribute significantly to the total nitrogen depositions in the United States