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Environ Sci Technol

Title:		Influence of Wildfire on Urban Ozone: An Observationally Constrained Box Modeling Study at a Site in the Colorado Front Range
Author(s):		Rickly PS; Coggon MM; Aikin KC; Alvarez RJ; Baidar S; Gilman JB; Gkatzelis GI; Harkins C; He J; Lamplugh A; Langford AO; McDonald BC; Peischl J; Robinson MA; Rollins AW; Schwantes RH; Senff CJ; Warneke C; Brown SS;
Address:		"Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, Colorado80305, United States. NOAA Chemical Sciences Laboratory, Boulder, Colorado80305, United States. IEK-8: Troposphere, Forschungszentrum Julich GmbH, Julich52428, Germany. Institute of Behavioral Science, University of Colorado, Boulder, Colorado80309, United States. Department of Chemistry, University of Colorado, Boulder, Colorado80309, United States"
Journal Title:		Environ Sci Technol
Year:		2023
Volume:		20230106
Issue:
Page Number:		-
DOI:		10.1021/acs.est.2c06157
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Increasing trends in biomass burning emissions significantly impact air quality in North America. Enhanced mixing ratios of ozone (O(3)) in urban areas during smoke-impacted periods occur through transport of O(3) produced within the smoke or through mixing of pyrogenic volatile organic compounds (PVOCs) with urban nitrogen oxides (NO(x) = NO + NO(2)) to enhance local O(3) production. Here, we analyze a set of detailed chemical measurements, including carbon monoxide (CO), NO(x), and speciated volatile organic compounds (VOCs), to evaluate the effects of smoke transported from relatively local and long-range fires on O(3) measured at a site in Boulder, Colorado, during summer 2020. Relative to the smoke-free period, CO, background O(3), OH reactivity, and total VOCs increased during both the local and long-range smoke periods, but NO(x) mixing ratios remained approximately constant. These observations are consistent with transport of PVOCs (comprised primarily of oxygenates) but not NO(x) with the smoke and with the influence of O(3) produced within the smoke upwind of the urban area. Box-model calculations show that local O(3) production during all three periods was in the NO(x)-sensitive regime. Consequently, this locally produced O(3) was similar in all three periods and was relatively insensitive to the increase in PVOCs. However, calculated NO(x) sensitivities show that PVOCs substantially increase O(3) production in the transition and NO(x)-saturated (VOC-sensitive) regimes. These results suggest that (1) O(3) produced during smoke transport is the main driver for O(3) increases in NO(x)-sensitive urban areas and (2) smoke may cause an additional increase in local O(3) production in NO(x)-saturated (VOC-sensitive) urban areas. Additional detailed VOC and NO(x) measurements in smoke impacted urban areas are necessary to broadly quantify the effects of wildfire smoke on urban O(3) and develop effective mitigation strategies"
Keywords:		NOx Voc biomass burning ozone smog smoke urban pollution;
Notes:		"PublisherRickly, Pamela S Coggon, Matthew M Aikin, Kenneth C Alvarez, Raul J 2nd Baidar, Sunil Gilman, Jessica B Gkatzelis, Georgios I Harkins, Colin He, Jian Lamplugh, Aaron Langford, Andrew O McDonald, Brian C Peischl, Jeff Robinson, Michael A Rollins, Andrew W Schwantes, Rebecca H Senff, Christoph J Warneke, Carsten Brown, Steven S eng 2023/01/07 Environ Sci Technol. 2023 Jan 6. doi: 10.1021/acs.est.2c06157"