title: Oxidative potential of coarse particulate matter (PM(10-2.5)) and its relation to water solubility and sources of trace elements and metals in the Los Angeles Basin.
abstract: In this study, potential sources of water-soluble (WS) and water-insoluble (WI) fractions of metals and trace elements in coarse particulate matter (CPM) (PM(10-2.5), 2.5 < dp < 10 μm) were identified and their association with the redox properties of CPM, measured by means of reactive oxygen species (ROS), was explored. CPM was collected during 2012-2013 in Central Los Angeles (LA) and 2013-2014 in Anaheim, CA. Generally, WI components contributed to a larger fraction of CPM ROS activity (as much as 64% and 54% at Central LA and Anaheim, respectively). Two major source factors were identified by principal component analysis for both the WS and WI fractions: vehicular abrasion and re-suspended road dust. Univariate analysis indicated that several species were correlated with CPM ROS activity: in WS fraction, metals such as Mn, Fe, Cd and Zn were associated with WS ROS, while in WI fraction Ti, Fe, Ni, Pb and Cr had the highest correlations with WI ROS activity. Multiple linear regression analysis revealed that both vehicular abrasion and re-suspension of road dust were associated with WS ROS activity, while only vehicular abrasion contributed significantly to the WI ROS activity. Moreover, comparison with previous studies indicated that the ROS activity of CPM has increased in the past 5 years in Central LA. We attribute this increase mainly to the elevated levels of re-suspension of road dust caused by the increase in vehicle speed and number of trucks in recent years in this area, reaffirming the growing importance of non-tailpipe traffic emissions on CPM toxicity.
authors.affiliation: University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, USA. sioutas@usc.edu.
authors.forename: Farimah
authors.initials: F
authors.lastname: Shirmohammadi
authors.affiliation: University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, USA. sioutas@usc.edu.
authors.forename: Sina
authors.initials: S
authors.lastname: Hasheminassab
authors.affiliation: University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, USA. sioutas@usc.edu.
authors.forename: Dongbin
authors.initials: D
authors.lastname: Wang
authors.affiliation: University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, USA. sioutas@usc.edu.
authors.forename: Arian
authors.initials: A
authors.lastname: Saffari
authors.affiliation: University of Wisconsin-Madison, Environmental Chemistry and Technology Program, Madison, WI, USA.
authors.forename: James J
authors.initials: JJ
authors.lastname: Schauer
authors.affiliation: University of Wisconsin-Madison, Environmental Chemistry and Technology Program, Madison, WI, USA.
authors.forename: Martin M
authors.initials: MM
authors.lastname: Shafer
authors.affiliation: University of California, Irvine, Department of Epidemiology, School of Medicine, Irvine, CA, USA.
authors.forename: Ralph J
authors.initials: RJ
authors.lastname: Delfino
authors.affiliation: University of Southern California, Department of Civil and Environmental Engineering, Los Angeles, CA, USA. sioutas@usc.edu.
authors.forename: Constantinos
authors.initials: C
authors.lastname: Sioutas
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D004784:Environmental Monitoring; D015141:Los Angeles; D008670:Metals / Q000032:analysis*; D052638:Particulate Matter / Q000032:analysis*; D012995:Solubility; D014131:Trace Elements / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D008670:Metals; D052638:Particulate Matter; D014131:Trace Elements