Abstract:Total gaseous mercury (TGM) was continuously monitored using high-resolution automatic atmospheric mercury vapor analyzer (Tekran 2537B) from November 2010 to November 2011 in Guangzhou. The annual average TGM concentration was (4.86±1.36)ng/m3, suggesting that the atmosphere was polluted by mercury in this area. The TGM level exhibited distinct seasonal variation by the following order: spring>winter>autumn>summer. TGM pollution was more serious in winter but less in summer, which was caused by meteorological factors such as boundary layer, static wind. The diurnal variation showed that the minimum concentration was at noon and dual peaks appeared in the morning and evening, respectively. Boundary layer and temperature had significant impact on the diurnal variation. According to the source appointment of gaseous mercury in Guangzhou, local coal-fired power and cement plants may be the major contributors to the TGM in Guangzhou.