There is substantial uncertainty in the magnitude and spatial distribution of the radiative forcing by aerosols. This uncertainty significantly limits our ability to assess the effect of natural and human induced changes in the chemistry of the atmosphere on global climate. Increased UV radiation has effects on human health, in particular human skin disease and has effects on the biosphere. Thus, it is necessary to monitor aerosols and UV radiation at ground stations. The spatial and temporal variations of aerosols are affected by regional meteorological conditions. Because emitted air pollutants have effects on not only the originating country but also neighbour nations, it is not national problems but an international issue. Therefore, there exists the need for international collaboration on characterizing atmospheric aerosols and their impact on UV radiation in Northeast Asia.