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Assessments of its risks to humans and ecosystems rely on an accurate understanding of global mercury cycling. This work shows that the chemical reactions and rates currently employed to interpret Hg chemistry in the atmosphere fails to explain observed atmospheric mercury concentrations and deposition. We report that model simulations incorporating recent developments in the photoreduction mechanisms of the oxidized forms of mercury (Hg\n                    <jats:sup>I<\/jats:sup>\n                    and Hg\n                    <jats:sup>II<\/jats:sup>\n                    ) lead to a significant model underestimation of global observations of these oxidized species in the troposphere and their surface wet deposition. This implies that there must be currently unidentified mercury oxidation processes in the troposphere.\n                  <\/jats:p>","DOI":"10.1073\/pnas.1922486117","type":"journal-article","created":{"date-parts":[[2020,11,23]],"date-time":"2020-11-23T20:41:04Z","timestamp":1606164064000},"page":"30949-30956","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":94,"title":["Photochemistry of oxidized Hg(I) and Hg(II) species suggests missing mercury oxidation in the troposphere"],"prefix":"10.1073","volume":"117","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0060-1581","authenticated-orcid":false,"given":"Alfonso","family":"Saiz-Lopez","sequence":"first","affiliation":[{"name":"Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, Spanish National Research Council (CSIC), 28006 Madrid, Spain;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleg","family":"Travnikov","sequence":"additional","affiliation":[{"name":"Meteorological Synthesizing Centre\u2013East of EMEP, 115419 Moscow, Russia;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7146-3035","authenticated-orcid":false,"given":"Jeroen E.","family":"Sonke","sequence":"additional","affiliation":[{"name":"G\u00e9osciences Environnement Toulouse, CNRS\/Observatoire Midi-Pyr\u00e9n\u00e9es (OMP)\/Universit\u00e9 de Toulouse, 31400 Toulouse, France;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colin P.","family":"Thackray","sequence":"additional","affiliation":[{"name":"Harvard John A. 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