Observational Study of Black Carbon Aerosol During Straw-Burning Period

Black carbon aerosol(BC) has been measured at three sites in Hefei City during May and June,2007.Analyzing these real-time BC data,the concentration characters and the sources of black carbon aerosol can be found.The average concentrations of BC in normal period and straw-burning period are 4.85(μg/m~3) and 8.38(μg/m~3),respectively.The significant difference shows that the straw-burning is one of the main sources.The correlation coefficients between daily average concentration of BC and PM_(10) is 0.74,while the values of(BC/PM_(10)) in normal period and straw-burning period are 4.7% and 7.9%,respectively.Through comparing to the BC concentration during straw-burning period in 2004,the results indicated that pollution of BC has reduced after straw-burning was forbidden by the government.