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The α-pinene ozonolysis under the different environmental conditions were observed in a smog chamber.The second-order rate constant (k) was determined to be (7.25 ± 0.06) × 10-17 cm3/(molecule.sec) under 20％ of relative humidity (RH) and room temperature.RH showed a marked influence on the α-pinene ozonolysis.The value of k increased with RH increase,which was 1.6 times faster at RH =80％ than that at RH =20％.Additionally,the value of k apparently changed in the presence of the aerosol particles.The diesel soot increased the k value.The fly ash prohibited the reaction,however,H2SO4-treated fly ash promoted the reaction.The information of products gained using FT-IR and SPAMS showed that pinonic acid,10-hydroxy-pinonic acid and pinic acid could be generated during the α-pinene ozonolysis.Water molecules could take part in the formation of the products,and play a vital role in the degradation of α-pinene.The atmospheric residence time calculation showed that the ozonolysis in the atmosphere is an important way of the α-pinene consumption as compared to that reacted with OH during daytime.The results suggested that the degradation of α-pinene via the ozonization in the atmosphere may be affected greatly by RH,as well as the presence of aerosol particles.The ozonolysis reaction may be an important way of the α-pinene consumption during daytime.