On Dec 9th, Shizhen and Gan attended the Symposium on New Pollutants (新污染物研究与治理大会) which was organized by China Association of Environmental Sciences (中国环境科学学会）and Chinese Research Academy of Environmental Sciences (中国环境科学研究院）in Beijing. Gan gave two invited talks, one on ‘Regional transport and source-sink processes of new pollutants’ , one on ‘An environmental atmospheric  science perspective on new pollutans in the atmosphere’. Shizhen gave a talk on MNPs and TWPs in the urban atmosphere. All the three talks were well received by the audiences who showed great interest in our thinkings and  findings. After the symposium, we had chance to have dinner with Yi Xin (怡欣） and Lin Tian （林田） who were around.