The 2nd Technical and Management Meeting of Sino-Swiss Clean Air China Project (Phase 1) was held virtually on March 5, 2021. The 1st meeting was taken place on February 4 in this year. Overall 16 participants attended the meeting, including project leaders of Dr. Andre Prevot, Prof. Jing Wang, and Prof. Junji Cao, together with other members from Paul Scherrer Institute (PSI), Swiss Federal Institute of Technology Zurich (ETH), and Institute of Earth Environment, Chinese Academy of Sciences (IEECAS). Dr. Markus Furger coordinated the meeting and gave a discussion report on the progresses and updates having been made thus far. Interactive communication and valuable inputs were made effectively by the participates with regard to the past and recent field campaigns, data management and databases, source apportionment and modelling , publications, and sharing and disseminating project results and experiences. To date, the project goes smoothly since it was started from September, 2019. Further virtual internal workshop to discuss outcomes and strengthen scientific exchange was scheduled on this May. A public virtual meeting for outreaching was also planned in fall 2021, where results will be presented to stakeholders and interested persons.