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List of Abstracts 202P-Observations 2.71 ID:4555 10:30Carbonaceous aerosol measurements at the “Demokritos” urban background site in Athens, Greece –Concentration levels and potential sourcesEvangelia Diapouli, Konstantinos EleftheriadisINT-RP, NCSR "Demokritos"Contact: ldiapouli@ipta.demokritos.grThe aim of this work was to examine the EC / OC and BC concentration levels at an urban backgroundstation in the Athens city, as well as their potential local and/or regional sources. All measurements wereconducted at the “Demokritos” site, in the periphery of the Athens Metropolitan area, during October 2009 –February 2010. PM2.5 elemental and organic carbon concentrations were measured in a 3-hr basis by the useof a Semi-Continuous OCEC Field Instrument (Sunset Laboratory Inc.). The NIOSH Method 5040 thermalprotocol was applied during samples analysis. Black carbon was measured continuously by an aethalometer(Model AE31, Magee Scientific). 24-hr mean OC and EC concentrations were measured equal to 2.1 ± 0.6µg m-3 and 0.6 ± 0.3 µg m-3, respectively. Regression of EC and OC 3-hr mean values yielded a relativelylow correlation coefficient (r = 0.63), indicative of the presence of different sources affecting each carbonfraction. This was also evident by the differences in the EC and OC diurnal cycles pattern. Elemental carbonconcentrations presented a clear peak during morning and evening rush hours, linking EC with vehiculartraffic. OC peak concentrations were observed during afternoon and evening hours, which could beattributed to formation of secondary organic aerosol. 3-hr mean EC concentrations determined thermally andoptically were highly correlated (r = 0.93), with a slope value equal to 0.87 and negligible intercept (-0.01).A high correlation was also observed between optically determined EC and BC concentrations (r = 0.89).The measurement period was characterized by stagnant conditions (1-hr mean wind speed values below 2 ms-1 for approximately 85 % of the data). The results of Conditional Probablity Funtion (CPF) analysis ofwind direction and concentration data suggest that the measured EC / OC concentration levels were mainlyof local origin.P-Observations 2.72 ID:4590 10:30Morphology and Chemical Analysis of Atmospheric particles at a low-income high population densitylocation of the City of Gaborone, BotswanaBaagi MmerekiUniversity of BotswanaContact: mmereki@mopipi.ub.bwAirborne aerosol particles were collected in a low-income high population density location of the city ofGaborone Botswana using a High Volume air-sampler. Samples were collected in the summer and wintermonths at a location bordering a busy high way and the low income locality. Morphologies and elementalcompositions of aerosol particles of different sizes were obtained by Scanning electron microscopy coupledwith energy-dispersive spectrometry. Preliminary results on diurnal variations on both morphology andelemental composition will be discussed including air-quality health related correlation factors.P-Observations 2.73 ID:4134 10:30The effect of anthropogenic pollution on the fractionation of gaseous mercury in coastal urban areasAnne L. Soerensen 1 , Henrik Skov 1 , Matthew S. Johnson 21 National Environmental Research Institute, Aarhus University2 CCAR, University of CopenhageniCACGP-IGAC 2010 14 July, 2010