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Ambient air samples were collected between March 17, 2009 and May 22, 2009 at a highway traffic site located in ShaLu, central Taiwan. Atmospheric particulates and particulate bound mercury Hg(p) dry deposition fluxes, concentrations (PM 2.5 , PM 2.5-10 and TSP ) were studied. The results indicate that the average ambient air particles dry deposition, PM 2.5 , PM 2.5-10 and TSP. concentrations were 145.03 μg/m 2 -min and 15.47, 9.50, 65.14 μg/m 3 , respectively. And the average dry deposition, PM 2.5 , PM 2.5-10 and TSP bound mercury Hg(p) concentrations were 0.9519 ng/m 2 -min and 0.1140, 0.0106, 0.0763 ng/m 3 , respectively. In addition, the average ambient air particles bound mercury Hg(p) compositions for PM 2.5 , PM 2.5-10 and TSP were 3.60, 3.45 and 44.99 ng/g, respectively. The results indicate that both of these two models (Baklanov and Sorensen, 2001;Zhang et al., 2001) are estimated as the measured dry deposition mass flux. The Baklanov model performs better results in the prediction of mass dry deposition flux. In addition, both of these two models slightly underestimate the measured dry deposition mass flux for particle bound Hg(p). Zhang's model performs better results in the prediction of Hg(p) dry deposition flux.

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This investigation determines ambient air arsenic (As), As(III), and As(V) concentrations in total suspended particulates (TSP) and dry deposition. Calculated/measured dry deposition flux ratios of ambient air As, As(III) and As(V) were evaluated using two dry deposition models at five characteristic sampling sites during 2009-2010.The highest average concentrations of As, As(III) and As(V) in TSP and dry deposition were measured at the Quan-xing industrial sampling site during AugustJanuary. The Quan-xing site, with many industrial factories under process around there regions, its air is extremely polluted. In addition, the average dry deposition velocities for ambient air total arsenic (As) at Bei-shi, Chang-hua, He-mei, Quanxing and Gao-mei were 0.60 (cm/sec), 0.57 (cm/sec), 0.73 (cm/sec), 0.67 (cm/sec) and 0.66 (cm/sec), respectively at these five characteristic sampling sites.The highest average seasonal variation for As, As(III) and As(V) in TSP and dry deposition were in winter and fall due to emissions from fossil fuel combustion by the nearby Taichung Thermal Power Plant (TTPP) and for household heating. The Noll and Fang model can be applied to predict dry deposition of As, As(III), and As(V) at these sampling sites.