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Successful decreases in nitrogen oxides emissions in the United States have substantially decreased nitrate deposition. By contrast, emissions of ammonia, an unregulated air pollutant, and resulting deposition of ammonium have grown. Expanded observations demonstrate that deposition of reactive nitrogen in the United States has shifted from a nitrate-dominated to an ammonium-dominated condition. Recognition of this shift is critical to formulating effective future policies to protect ecosystems from excess nitrogen deposition.<\/jats:p>","DOI":"10.1073\/pnas.1525736113","type":"journal-article","created":{"date-parts":[[2016,5,10]],"date-time":"2016-05-10T00:09:33Z","timestamp":1462838973000},"page":"5874-5879","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":378,"title":["Increasing importance of deposition of reduced nitrogen in the United States"],"prefix":"10.1073","volume":"113","author":[{"given":"Yi","family":"Li","sequence":"first","affiliation":[{"name":"Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bret A.","family":"Schichtel","sequence":"additional","affiliation":[{"name":"National Park Service, Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John T.","family":"Walker","sequence":"additional","affiliation":[{"name":"Office of Research and Development, National Risk Management Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donna B.","family":"Schwede","sequence":"additional","affiliation":[{"name":"Office of Research and Development, National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xi","family":"Chen","sequence":"additional","affiliation":[{"name":"Office of Research and Development, National Risk Management Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher M. 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