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Aerosols in the atmosphere can scatter and absorb solar radiation and their spatial/temporal distributions are highly inhomogeneous due to short lifetimes (about a few weeks of less).Through scattering and absorption of solar radiation, aerosols directly affect visibility and climate through the modification of the Earths energy budget (Charlson et al., 1992; Yan, 2007; Wang, 2012).This study investigates longtime trends characteristics of aerosol light scattering coefficient at Seoul and a background site (Baengnyeongdo) around 100 km upstream of Seoul in Korea.Aerosol scattering coefficients were measured continu ously with nephelometers and various measurements also.The analysis period is limited to one year of 2011.