Three types of plastic pellets that were treated by different UV irradiation times in three different environments were examined using Raman spectroscopy.As shown in Fig. , the Raman spectra showed that there were no significant changes in the weathered plastic pellets in the three different environments compared with the virgin plastic pellets, but there were different intensities in the characteristic peaks after exposure to UV irradiation. These results were in accord with Lenz et al.Where both PE and PP showed a slight reduction in the intensity of characteristic peaks after exposure to simulated sunlight in air for 1634 h.In addition, Raman spectroscopy has been widely used in the qualitative analysis of microplastics.Because plastic particles of small size (>1 μm) can be identified by Raman spectroscopy, it appeared to be a good method for identification.However, in reality, some inorganic additives added into plastics during the manufacturing process could interfere with the determination of plastics.Thus, there are some deficiencies in the Raman analysis for the identification of plastics, especially in the analysis of aging experiments.