Continuous samplings of atmospheric aerosols, gas and fallout were carried out from July 1998 to December 1999 at the peak of Mt. Birao in Teshikaga town, eastern Hokkaido, Japan. Also, we collected lake water both in Lake Masyu near Mt. Birao and Lake Kuttara in Shiraoi town, southern Hokkaido. Atmospheric concentrations of total particulate mass (TPM), carbonacious matter and sulfate were not shown seasonal variations, however, the concentrations of heavy metals such as lead, zinc and arsenic etc. significantly increased in winter. From the results of isentropic trajectory analyses, the pollutant was supposed to be transported from the direction of northeastern China and Siberia in winter season. Also the metals in insoluble atmospheric fallout significantly increased from winter to spring. Pollutant such as nickel and lead, which supposed to fall out from the atmosphere, in both lakes. Moreover, the concentrations such as zinc, nickel, vanadium and copper, tend to increase from those measured in 1981.
