Atmospheric particle-bound mercury Hg(p) concentrations and dry deposition were investigated at Westing Park and Taichung airport sampling sites in the middle of Taiwan during the years 2011 and 2012.The calculated/measured dry deposition flux ratios of ambient air particles and Hg(p) with Petroff and Zhang's model were also studied. At the Westing Park sampling site, the particle-bound Hg(p) concentration and Hg (p) dry deposition velocity were 0.022 ng/m 3 and 1.74 cm/sec, respectively, while at the Taichung airport sampling site these were 0.027 ng/m 3 and 1.03 cm/sec, respectively. The average calculated/measured dry deposition flux ratios for ambient air particles and Hg(p) at average particle sizes of 10, 20 and 23 μm in were 0.79, 1.22, and 1.43, and 0.93, 1.43 and 1.69 at the Westing Park sampling site, respectively. The average calculated/measured dry deposition flux ratios for ambient air particles and Hg(p) at average particle sizes of 10, 20 and 23 μm were 0.92, 1.42, and 1.67, and 1.05, 1.61 and 1.90 at the Taichung airport sampling site, respectively. This study also found that Petroff and Zhang's model produced the best for the prediction of ambient air particulates and Hg(p) dry deposition for a particle size of 10 μm at both the Westing Park and Taichung airport sampling sites, and that the results became worse as the particle size increased.

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This investigation studied the concentrations of ambient air total gaseous mercury (TGM) during the rainy periods at the HungKuang traffic sampling site in central Taiwan from May 26 to June 16, 2014. The results were compared with those of a previous study for ambient air TGM during non-rainy daytime and nighttime periods at the Hung-Kuang traffic sampling site, which was conducted during March 21 to July 20, 2012. The observed mean concentration of ambient air TGM was 1.16 ng/m 3 during the rainy periods at the Hung-Kuang traffic sampling site. The mean ambient air TGM concentrations were higher in the non-rainy sampling period in daytime than in the rainy sampling period from this study. The mean ratio of non-rainy sampling period in daytime to that of rainy sampling period for ambient air TGM were 3.15. Furthermore, the mean ambient air TGM concentrations were higher in the non-rainy sampling period in nighttime in than in the rainy sampling period for this study. The mean rations for non-rainy sampling period in nighttime to that of the rainy sampling period for ambient air TGM were 2.70. The results obtained in this study also revealed that the ambient air TGM concentrations during the rainy period had the lowest concentrations when compared with the other sampling sites in other world regions.