110823 20230519145616.0 doi 10.1016/j.scitotenv.2021.148728 sideral 127477 ART-2021-127477 eng Veld, Marten I. Compositional changes of PM2.5 in NE Spain during 2009–2018: a trend analysis of the chemical composition and source apportionment 2021 Access copy available to the general public Unrestricted In this work, time-series analyses of the chemical composition and source contributions of PM2.5 from an urban background station in Barcelona (BCN) and a rural background station in Montseny (MSY) in northeastern Spain from 2009 to 2018 were investigated and compared. A multisite positive matrix factorization analysis was used to compare the source contributions between the two stations, while the trends for both the chemical species and source contributions were studied using the Theil–Sen trend estimator. Between 2009 and 2018, both stations showed a statistically significant decrease in PM2.5 concentrations, which was driven by the downward trends of levels of chemical species and anthropogenic source contributions, mainly from heavy oil combustion, mixed combustion, industry, and secondary sulfate. These source contributions showed a continuous decrease over the study period, signifying the continuing success of mitigation strategies, although the trends of heavy oil combustion and secondary sulfate have flattened since 2016. Secondary nitrate also followed a significant decreasing trend in BCN, while secondary organic aerosols (SOA) very slightly decreased in MSY. The observed decreasing trends, in combination with the absence of a trend for the organic aerosols (OA) at both stations, resulted in an increase in the relative proportion of OA in PM2.5 by 12% in BCN and 9% in MSY, mostly from SOA, which increased by 7% in BCN and 4% in MSY. Thus, at the end of the study period, OA accounted for 40% and 50% of the annual mean PM2.5 at BCN and MSY, respectively. This might have relevant implications for air quality policies aiming at abating PM2.5 in the study region and for possible changes in toxicity of PM2.5 due to marked changes in composition and source apportionment. info:eu-repo/grantAgreement/ES/AGAUR/2017 SGR41 info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2019-108990RB-I00 info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2016-78594-R info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 10.754 2021 ENVIRONMENTAL SCIENCES 26 / 279 = 0.093 2021 Q1 T1 1.806 2021 Environmental Chemistry 2021 Q1 Waste Management and Disposal 2021 Q1 Environmental Engineering 2021 Q1 14.1 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Alastuey, Andrés Pandolfi, Marco Amato, Fulvio Pérez, Noemí Reche, Cristina Via, Marta Minguillón, María Cruz Escudero, Miguel Universidad de Zaragoza (orcid)0000-0001-8227-5689 Querol, Xavier 2002 385 Universidad de Zaragoza Dpto. Física Aplicada Área Física Aplicada 795 (2021), 148728 [18 pp.] Sci. total environ. SCIENCE OF THE TOTAL ENVIRONMENT 0048-9697 3667613 http://zaguan.unizar.es/record/110823/files/texto_completo.pdf Versión publicada 2368099 http://zaguan.unizar.es/record/110823/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:110823 articulos driver 2023-05-18-16:10:49 ARTICLE