In this paper, the influence of particle size on SO_2adsorption by bamboo carbon (BC) was studied and its adsorption capacity was determined. The ability of BC to adsorb mixed binary pollutants was also studied. The results show that BC has better capacity for SO_2adsorption, compared with three other biomassbased activated carbons. The adsorption efficiency reached 99.6±0.2% when BC particle size was smaller than 1.7mm. The unit SO_2adsorption capacity of BC reached 8.46mg/g of BC. No inhibition of SO_2adsorption was found when NO and NO_{2concentration} were low higher concentration NO_x were found to inhibit SO_{2purification}. The purification efficiency of SO_2reduced 2.9% when NO concentration increased from 268μg/m^3to 536μg/m³. While it decreased 5.7% when NO_{2concentration} increased from 411μg/m^3to 821μg/m³. The inhibition of formic acid, acetic acid purification by SO_2ranged within 1%. Within the range of experimental concentrations, lower inhibition of SO_{2purification} by formic acid and acetic acid was found, and the average SO_{2purification} efficiency were 90.4% and 90.5%, respectively.