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 NO 2 . The results showed a higher relative contribution in winter (0.45

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