On the morning of 18th of Nov, Xiaofei and Lele successfully defended their PhD and MSc degree thesis, respectively. Xiaofei worked on tropical marine carbonaceouse aerosols over the South China Sea and East Indian Ocean. Lele worked on the POPs in the air the Pearl River Delta region. The committee members included Profs. Chen Yingjun, Zhang Yanlin, Tian Chongguo, Xu Weihai, Chen Duohong and Li Jun. Congratulations to Xiaofei and Lele!