In 't Veld Marten, Seco Roger, Reche Cristina, Pérez Noemi, Alastuey Andres, Portillo-Estrada Miguel, Janssens Ivan A, Peñuelas Josep, Fernandez-Martinez Marcos, Marchand Nicolas, Temime-Roussel Brice, Querol Xavier, Yáñez-Serrano Ana Maria
Institute of Environmental Assessment and Water Research, IDAEA-CSIC, 08034 Barcelona, Spain; Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain.
Institute of Environmental Assessment and Water Research, IDAEA-CSIC, 08034 Barcelona, Spain.
Sci Total Environ. 2024 Jan 1;906:167159. doi: 10.1016/j.scitotenv.2023.167159. Epub 2023 Sep 25.
Volatile organic compounds (VOCs) play a crucial role in the formation of ozone (O) and secondary organic aerosol (SOA). We conducted measurements of VOC ambient mixing ratios during both summer and winter at two stations: a Barcelona urban background station (BCN) and the Montseny rural background station (MSY). Subsequently, we employed positive matrix factorization (PMF) to analyze the VOC mixing ratios and identify their sources. Our analysis revealed five common sources: anthropogenic I (traffic & industries); anthropogenic II (traffic & biomass burning); isoprene oxidation; monoterpenes; long-lifetime VOCs. To assess the impact of these VOCs on the formation of secondary pollutants, we calculated the ozone formation potential (OFP) and secondary organic aerosol formation potential (SOAP) associated with each VOC. In conclusion, our study provides insights into the sources of VOCs and their contributions to the formation of ozone and SOA in NE Spain. The OFP was primarily influenced by anthropogenic aromatic compounds from the traffic & industries source at BCN (38-49 %) and during winter at MSY (34 %). In contrast, the summer OFP at MSY was primarily driven by biogenic contributions from monoterpenes and isoprene oxidation products (45 %). Acetaldehyde (10-35 %) and methanol (13-14 %) also made significant OFP contributions at both stations. Anthropogenic aromatic compounds originating from traffic, industries, and biomass burning played a dominant role (88-93 %) in SOA formation at both stations during both seasons. The only exception was during the summer at MSY, where monoterpenes became the primary driver of SOA formation (41 %). These findings emphasize the importance of considering both anthropogenic and biogenic VOCs in air quality management strategies.
挥发性有机化合物（VOCs）在臭氧（O）和二次有机气溶胶（SOA）的形成过程中起着关键作用。我们在夏季和冬季对两个站点的挥发性有机化合物环境混合比进行了测量：一个是巴塞罗那城市背景站点（BCN），另一个是蒙特塞尼农村背景站点（MSY）。随后，我们采用正定矩阵因子分解法（PMF）来分析挥发性有机化合物的混合比并确定其来源。我们的分析揭示了五个常见来源：人为源I（交通与工业）；人为源II（交通与生物质燃烧）；异戊二烯氧化；单萜烯；长寿命挥发性有机化合物。为了评估这些挥发性有机化合物对二次污染物形成的影响，我们计算了与每种挥发性有机化合物相关的臭氧生成潜势（OFP）和二次有机气溶胶生成潜势（SOAP）。总之，我们的研究深入了解了西班牙东北部挥发性有机化合物的来源及其对臭氧和二次有机气溶胶形成的贡献。臭氧生成潜势主要受BCN站交通与工业源的人为芳香族化合物影响（38 - 49%），以及MSY站冬季的影响（34%）。相比之下，MSY站夏季的臭氧生成潜势主要由单萜烯和异戊二烯氧化产物的生物源贡献驱动（45%）。乙醛（10 - 35%）和甲醇（13 - 14%）在两个站点的臭氧生成潜势贡献中也占显著比例。在两个季节中，来自交通、工业和生物质燃烧的人为芳香族化合物在两个站点的二次有机气溶胶形成中起主导作用（88 - 93%）。唯一的例外是MSY站夏季，此时单萜烯成为二次有机气溶胶形成的主要驱动因素（41%）。这些发现强调了在空气质量管理策略中考虑人为和生物源挥发性有机化合物的重要性。
