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Visibility data have long needed to traffic meteorological monitoring and warning system,but visibility data have monitored with expensive special equipment.Visibility degradation in fog is due to the light scattering of fog droplets,which are transit from aerosols via activation.Considering strong correlation between PM 2.5 mass concentration and visibility,regression models can be useful tools for retrieving visibility data from available PM 2.5 data.In this study,PM 2.5 is measured by low cost and commercial equipment.