activities,particularly by increases of sulfates, organic condensates and soot [2–4]. Although the interactions of aerosols with radiation have been known for a long time [5,6], it is only recently that the possible role of atmospheric aerosols in a global change scenario has been considered. The warming/cooling effects of aerosols can be separated
into the direct effects by scattering and absorption of solar radiation and the indirect effects by passing through cloud formation. The magnitude of the aerosol radiative forcing is quite uncertain. IPCC estimates that the cooling effect by
aerosols may be comparable to the warming effect by greenhouse gases [1].