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List of Abstracts 1823 Manchester Metropolitan University, Manchester, UKContact: Albert_Mmari@yahoo.comWhile many investigations on atmospheric pollution have been conducted in Europe, North America, SouthAmerica and various parts of Asia, only a handful of such studies have been reported for Africa, especiallySub-Saharan Africa. Atmospheric pollution, which is associated with atmospheric pollutants, viz particulatematter and gaseous pollutants, cause a wide spectrum of effects, such as atmospheric corrosion of variousmaterials. It is now an increasingly important environmental problem due to the increase of industrialactivities, traffic, biomass burning, and the ever increasing demand for power, mostly supplied by coalpower plants introducing air pollutants into the atmosphere. Atmospheric corrosion of local buildingmaterials, e.g. galvanized corrugated iron sheets widely used as roofing materials, along the coast of Dar esSalaam and neighbouring regions, is a major problem. As part of solving this problem, the ambient airquality to which the local building materials are exposed to, was determined by measuring concentrationlevels of NO2, SO2 and O3 gaseous pollutants at exposure sites, S1, S2 and S3 - aligned at intervals 0 km,15 km and 40 km from the coastline over a period of 3 years to observe the influence of marine atmosphere.The average concentrations of NO2, SO2 and O3 from S1 (19.7, 3.5 and 25.3 µg/m3) during 2005 – 2007, incomparison to completed studies, are indicative of a polluted area. This is related to the meteorologicalconditions as well as the air mass movements, as shown by the backward air masses trajectories models.Possible sources for the concentration variations were identified for S1, S2 and S3. Atmospheric corrosion ofconstruction materials confirmed the higher corrosivity of the coastal site compared to the inland site.Furthermore, an analysis of the corrosion products formed on the surfaces of galvanized roofing samplesindicate a variety of corrosion products that can be formed, depending on the site atmospheric conditions.P-Observations 2.35 ID:4323 10:30Remote Sensing Measurement of 2-Dimensional NO2 and SO2 Distributions from Power Plant StacksUsing GIST Imaging-DOAS SystemJihyo Chong 1 , Han Lim Lee 2 , Jong Ho Baeek 1 , Hwa Young Jeoung 1 , Myojeong Gu 1 , Young Joon Kim 11 Advanced Environmental Monitoring Research Center, Gwangju Institute of Science and Technology(GIST)2 Atmospheric Radiation Laboratory, Department of Atmospheric Sciences, Yonsei UniversityContact: jihyojung@gist.ac.krAnthropogenic emissions of nitrogen and sulfur compounds from power plants account for significantportion of the total emissions to the atmosphere and are of great concern due to their impact on theatmospheric environment. This study includes remote measurements of these compounds to understand theirsubsequent chemical reactions in the atmosphere, which are important for quantitative assessment of theircontributions to local and regional air quality. Slant column densities (SCDs) of power-plant-generated NO2and SO2 were remotely measured using imaging differential optical absorption spectroscopy (Imaging-DOAS) with scattered sunlight as a light source. The vertical profiles of NO2 and SO2 SCD above thepower plant stacks were simultaneously probed using a pushbroom sensing method. Measured SCDs wereconverted to mixing ratios to determine the rates of NO2 and SO2 increases at the center of the plume.Knowledge on the rates of NO2 and SO2 increases is important since SO2 and NOx compete for the sameoxidizing radicals, and the amount of NOx is related to SO2 oxidation rate and sulfate formation. Here, weintroduce a retrieval scheme to determine the rate of NO2 and SO2 increases in the power plant plumesusing the I-DOAS technique and present the results from Taean thermal power plant. The derived mixingratios measured on October 17, 2007 reached up to 12.6 ppm for NO2 and 30.1 ppm for SO2 with SCDvalues of 4.38 x 10e17 (NO2) and 4.44 x 10e17 (SO2) molecules/cm2, respectively. For validation ofimaging-DOAS measurement results those derived NO2 and SO2 mixing ratios were compared to thosemeasured by in-situ analyzers and continuous stack monitoring system.iCACGP-IGAC 2010 14 July, 2010