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Aerosol mass scattering efficiency(MSE),used for the scattering coefficient apportionment of aerosol species,is often studied under the condition of low aerosol mass loading in developed countries.Severe pollution episodes with high particle concentration frequently happened in eastern urban China in recent years.Based on synchronous measurement of aerosol physical,chemical,and optical properties at the megacity of Shanghai for two months during autumn 2012,we studied MSE characteristics at high aerosol mass loading.