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Measurements were conducted during the Wintertime INvestigation of Transport, Emissions, and Reactivity campaign in February\u2013March of 2015 aboard the NCAR\u2010NSF C\u2010130 aircraft. Fifty air mass encounters were identified in which SO<jats:sub>2<\/jats:sub> levels were elevated ~5 ppb above ambient background levels and in proximity to operational power plants. Each encounter was attributed to one or more potential emission sources using a simple wind trajectory analysis. In case studies, we compare measured emission ratios to those reported in the 2011 National Emissions Inventory and present evidence of the conversion of HCl emitted from power plants to ClNO<jats:sub>2<\/jats:sub>. Taking into account possible chemical conversion downwind, there was general agreement between the observed and reported HCl:SO<jats:sub>2<\/jats:sub> emission ratios. Reactive bromine species (Br<jats:sub>2<\/jats:sub>, BrNO<jats:sub>2<\/jats:sub>, and\/or BrCl) were detected in the exhaust of some coal\u2010fired power plants, likely related to the absence of wet flue gas desulfurization emission control technology. Levels of bromine species enhanced in some encounters exceeded those expected assuming all of the native bromide in coal was released to the atmosphere, though there was no reported use of bromide salts (as a way to reduce mercury emissions) during Wintertime INvestigation of Transport, Emissions, and Reactivity observations. These measurements represent the first ever in\u2010flight observations of reactive gaseous chlorine and bromine containing compounds present in coal\u2010fired power plant exhaust.<\/jats:p>","DOI":"10.1029\/2018jd029284","type":"journal-article","created":{"date-parts":[[2018,9,17]],"date-time":"2018-09-17T15:40:19Z","timestamp":1537198819000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Airborne Observations of Reactive Inorganic Chlorine and Bromine Species in the Exhaust of Coal\u2010Fired Power Plants"],"prefix":"10.1029","volume":"123","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5057-2168","authenticated-orcid":false,"given":"Ben H.","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Atmospheric Sciences University of Washington  Seattle WA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe 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