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List of Abstracts 215Ca, Cd, Cu, Fe, Mg, Mn, Mo, Ni, Pb, S, Sb, Sn, and Zn) was determined in the different sizes of the samples(A < 37 µm, 37< B < 55, 55< C < 75 and 75< D < 100). X-ray powder diffraction was selected to detectmajor components: minerals, silicate glass and sulphates. Individual mineral dust particles were analyzed bySEM- EDAX showing that sulphur tended to reside on the particles surface, while Al, Ca, Mg, K, Fe and Siwere all an integral part of the particles. Elements content was quantified by ICP OES in the four particlesize ranges. Special attention was paid to the determination of key traffic related elements (TRE´s): Cu, Mo,Pb, Ni, S, Sb and Zn. Concentrations of elements were averaged over the monitoring sites. Geologicalelements exhibited the higher concentrations: Fe (28-43 mg g-1) > Al (13-40 mg g-1) >> Ca (1.7-6.9 mg g-1), followed by Mg (2.5-5.5 mg g-1) > S (0.2-1.7 mg g-1). Concentrations pattern showed high variability inthe four fractions but in all cases, higher concentrations were detected in the smaller size fractions (A and B).The TRE´s concentrations (mg g-1) varied from < 0.3 (for Ni) to 1.53 (for Zn). The smallest size fractionwere particularly enriched in Sb > Cd > Cu which are of particular interest from the environmental andhuman health standpoint. To the best of our knowledge this is the first study devoted to the multielementalcharacterization of the Buenos Aires road dust.P-Observations 2.96 ID:4604 10:30WOODSMOKE SOURCE APPORTIONMENT AND HOME INFILTRATION STUDY IN THERURAL ANNAPOLIS VALLEY, NOVA SCOTIA, CANADAMark Gibson 1 , Tony J. Ward 2 , Amanda J. Wheeler 3 , Judy R. Guernsey 1 , Matt P. Seaboyer 1 , PatrickBazinet 1 , Gavin H. King 1 , Neil K. Brewster 1 , James Kuchta 1 , Adrian Macdonald 1 , Jenna Higgins 1 , RyanPotter 1 , Dave M. Steib 41 Atlantic RURAL Centre, Dalhousie University, Halifax, NS, Canada2 Center for Environmental Health Sciences, University of Montana, Missoula, Montana, USA3 Air Health Science Division, Health Canada, Ottawa, Ontario, Canada4 Healthy Environments and Consumer Safety Branch, Health Canada, Ottawa, Ontario, CanadaContact: mark.gibson@dal.caWoodsmoke has recently received increasing attention as an important source of particulate matter,particularly in rural areas. Indoor woodstoves and outdoor wood boilers are widely used in the AnnapolisValley, in rural Nova Scotia, and the area’s topography is conducive to trapping emissions especially duringthermal inversions. In an effort to quantify the impact of these factors on local air quality, the sourcecontribution of residential wood burning to ambient PM2.5 at one fixed site in the Annapolis Valley, wasanalyzed during the winter 2008/2009 (phase 1). 4 x 24-hr PM2.5 filters, continuous PM2.5 using TSI Inc.Dust Traks, and associated gases (VOC, NO2, O3) were measured over 50 days between 24 February 2009and 7 May 2009 near the town of Middleton, located in the longitudinal centre of the Annapolis Valley. ThePM2.5 chemical species analyzed included levoglucosan (woodsmoke marker), elements, ions, C14(confirmatory marker for woodsmoke), organic and elemental carbon. g m-3 observed fromµThere werenumerous short-term excursions over 100 PM2.5 Dust Trak measurements. There was no significantdifference (P = 0.524) between the Dust Trak PM2.5 and Dust Trak PM10 concentrations suggesting that thePM10 size fraction was dominated by PM2.5. Chemical Mass Balance (USEPA CMB v8.2/SPECIATEv4.2) conducted on 16 of the 50 PM2.5 samples thus far yielded an average source contribution of residentialwoodsmoke to the total PM2.5 concentration of 56.2% (range 32.6% – 73%), with 12.4 % NH4NO3 (range5.0% - 20%), 24.1% SO4 (range 11.0% - 47%), 9.2% (NH4)2SO4 (range 2% - 19.8%), 3.9% unknown mass(range 0.6% - 14%) with no CMB statistically significant input from vehicle emissions. In phase 2 of thestudy, an investigation of woodsmoke home infiltration in 30 homes was conducted during winter2009/2010, together with an evaluation of the effectiveness of electrostatic air cleaners at reducing indoorPM2.5 concentrations. Significant (P