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Sci Total Environ

Title:		"Traffic, transport, and vegetation drive VOC concentrations in a major urban area in Texas"
Author(s):		Shrestha S; Yoon S; Erickson MH; Guo F; Mehra M; Bui AAT; Schulze BC; Kotsakis A; Daube C; Herndon SC; Yacovitch TI; Alvarez S; Flynn JH; Griffin RJ; Cobb GP; Usenko S; Sheesley RJ;
Address:		"Department of Environmental Science, Baylor University, Waco, TX, USA. Department of Environmental Science, Baylor University, Waco, TX, USA; Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA; TerraGraphics Environmental Engineering, Pasco, WA, USA. Department of Civil and Environmental Engineering, Rice University, TX, USA. Department of Civil and Environmental Engineering, Rice University, TX, USA; Department of Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, USA. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA; Universities Space Research Association, NASA/GSFC, Columbia, MD, USA. Aerodyne Research, Inc., Billerica, MA, USA. Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA. Department of Environmental Science, Baylor University, Waco, TX, USA. Electronic address: Rebecca_Sheesley@baylor.edu"
Journal Title:		Sci Total Environ
Year:		2022
Volume:		20220512
Issue:		Pt 2
Page Number:		155861 -
DOI:		10.1016/j.scitotenv.2022.155861
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"The population of Texas has increased rapidly in the past decade. The San Antonio Field Study (SAFS) was designed to investigate ozone (O(3)) production and precursors in this rapidly changing, sprawling metropolitan area. There are still many questions regarding the sources and chemistry of volatile organic compounds (VOCs) in urban areas like San Antonio which are affected by a complex mixture of industry, traffic, biogenic sources and transported pollutants. The goal of the SAFS campaign in May 2017 was to measure inorganic trace gases, VOCs, methane (CH(4)), and ethane (C(2)H(6)). The SAFS field design included two sites to better assess air quality across the metro area: an urban site (Traveler's World; TW) and a downwind/suburban site (University of Texas at San Antonio; UTSA). The results indicated that acetone (2.52 +/- 1.17 and 2.39 +/- 1.27 ppbv), acetaldehyde (1.45 +/- 1.02 and 0.93 +/- 0.45 ppbv) and isoprene (0.64 +/- 0.49 and 1.21 +/- 0.85 ppbv; TW and UTSA, respectively) were the VOCs with the highest concentrations. Additionally, positive matrix factorization showed three dominant factors of VOC emissions: biogenic, aged urban mixed source, and acetone. Methyl vinyl ketone and methacrolein (MVK + MACR) exhibited contributions from both secondary photooxidation of isoprene and direct emissions from traffic. The C(2)H(6):CH(4) demonstrated potential influence of oil and gas activities in San Antonio. Moreover, the high O(3) days during the campaign were in the NO(x)-limited O(3) formation regime and were preceded by evening peaks in select VOCs, NO(x) and CO. Overall, quantification of the concentration and trends of VOCs and trace gases in a major city in Texas offers vital information for general air quality management and supports strategies for reducing O(3) pollution. The SAFS campaign VOC results will also add to the growing body of literature on urban sources and concentrations of VOCs in major urban areas"
Keywords:		Acetone *Air Pollutants/analysis China Environmental Monitoring/methods *Ozone/analysis Texas *Volatile Organic Compounds/analysis Ethane Methane Ozone Ptr-ms San Antonio Voc;
Notes:		"MedlineShrestha, Sujan Yoon, Subin Erickson, Matthew H Guo, Fangzhou Mehra, Manisha Bui, Alexander A T Schulze, Benjamin C Kotsakis, Alexander Daube, Conner Herndon, Scott C Yacovitch, Tara I Alvarez, Sergio Flynn, James H Griffin, Robert J Cobb, George P Usenko, Sascha Sheesley, Rebecca J eng Netherlands 2022/05/15 Sci Total Environ. 2022 Sep 10; 838(Pt 2):155861. doi: 10.1016/j.scitotenv.2022.155861. Epub 2022 May 12"