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To evaluate the impact of PM size distribution on aerosol properties,PM1 and PM2.5 samples were collected and aerosol scattering coefficients(bsp)were measured synchronously at urban site in Guangzhou,during the typicalsummer and winter periods.The excellent,good,lightly polluted,moderately polluted and heavily polluted days based on PM2.5 mass were categorized,according to Chinas Air Quality Index(AQI)(HJ633-2012).