“…Collaborative research in Russia has been focused on CC, AQ, dynamics of the land-atmosphere interactions and feedbacks covering topics like permafrost thawing, greenhouse gas (GHG) emissions and sink processes, aerosol formation, environmental health and Artic greening and browning (e.g. Paasonen et al, 2013;Ezhova et al, 2018Ezhova et al, , 2020Petäjä et al, 2020). In China, INAR's collaboration interest has been on understanding the complex air pollution cocktail (Kulmala, 2015) including feedbacks with boundary layer processes and atmospheric aerosol population (Ding et al, 2016a;Petäjä et al, 2016), particularly in the most polluted megacity environments.…”