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Rapid increase in concentrations of greenhouse gases since the industrial period has given rise to concern over their impact on climate changes. The concentrations of greenhouse gases have been measured at KGAWO (Korea Global Atmosphere Watch Observatory) in Anmyeon, Korea since 1998. The CO2, CH4, N2O, CFC11, and CFC12 concentrations of greenhouse gases observed by KGAWO in Anmyeon are 376.3 ppm, 1929.2 ppb, 316.5 ppb, 268.9 ppt, and 542.1 ppt respectively during the period from 1999 to 2003 (5-year annual mean). High concentrations of CO2 during the winter and the spring season might be principally affected by using the fossil fuel for heating and industrial operations. Although the measuring site in Anmyeon is regarded to be less influenced from anthropogenic effects, the CO2, CH4, and N2O concentrations in Anmyeon is slowly increased until recently. This fact suggests a local effect caused by development around the Anmyeon region as well as a long range transport from China located at the upwind direction. The inter-annual variation of CFC11 shows gradually decreasing, but that of CFC12 shows somewhat steady state differing from the CFC11 case.