Light-absorbing particulate pollutants in snow decrease snow reflectance significantly bring important effects on energy balance and climate change.The reduction of snow reflectance due to pollutants is an important and active research topic.In this study,a controlled experiment was carried out to measure the spectral reflectance of snow,in which the different synthetic pollutant amount was added.The study area is located in Fuyun county of Xinjiang Province where the seasonal snow area is representative of arid and semiarid region,and the spectral reflectance of the snow pollutant used in our experiment was also measured.The impacts of the pollutant with different concentrations on snow reflectance were analyzed quantitatively by building a linear mixing model using measurements.The results show that the relationship between reduction of snow reflectance and the pollutant concentration was nonlinear.As total pollutant concentration increased,the impact of 1 ppm(parts per million)pollutant on snow reflectance decreased.In experiment,the impact decreased by more than one-third when the concentration increased from 1 813 ppm to 9 507 ppm.Moreover,this study found that the physical characteristics(such as grain size and shape)of snow and pollutants also played important role in the variation of dirty snow reflectance besides of the pollutant concentration.