Abstract
Daily mass concentrations of PM1, PM2.5, and PM10 were measured along with meteorological parameters from October 2008 to October 2009 in the city of Elche, close to the southeastern Spanish Mediterranean coast. Annual mean levels of 9.2, 13.2, and 26.2 μg m−3 were obtained for PM1, PM2.5, and PM10, respectively. PM2.5 and PM10 concentrations were lower than those previously measured at the same location due to unusual weather conditions that occurred during winter 2009, specially the decrease in the number of high atmospheric stability episodes. The contribution of road traffic to the levels of submicron (PM1), fine (PM2.5–1), and coarse (PM10–2.5) particles was studied by correlating PM concentrations with NO2. The results showed a higher relative contribution in winter (0.45 < r < 0.65) than in summer (−0.26 < r < 0.05). However, the scarce variability in traffic intensity (in terms of number of vehicles per day) was unable to explain daily and seasonal variations in PM levels. Rather, these variations were associated to seasonal changes in other PM sources and meteorological conditions. The three size fractions showed good negative correlations with wind speed during winter, suggesting that the main effect of cold season winds was the dilution of atmospheric aerosols. For the coarse fraction, good correlation coefficients were obtained with temperature and solar radiation (0.60 and 0.70, respectively) due to identical seasonal behavior of coarse PM and these parameters during the study period.
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Acknowledgements
We thank the Air Quality Surveillance Network of the Valencian Community Regional Government and the Oficina Municipal de Tráfico de Elche for supplying data and P. Nordstrom, C. Chofre, and J. Giménez for their assistance in this work. This work was supported by the Ministerio de Educación y Ciencia under the CGL2007-63326 (DAPASE) project.
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Galindo, N., Varea, M., Gil-Moltó, J. et al. The Influence of Meteorology on Particulate Matter Concentrations at an Urban Mediterranean Location. Water Air Soil Pollut 215, 365–372 (2011). https://doi.org/10.1007/s11270-010-0484-z
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DOI: https://doi.org/10.1007/s11270-010-0484-z