The 2025 ACAM training school and workshop were held in Bali, Indonesia, with the training school organized on 9-10 June, followed by the ACAM workshop on 11-13 June. The training school was attended by 40 early-career participants (students and postdocs), while over 100 participants attended the workshop. The training school focused on enhancing scientific and technical capacity in the areas of remote sensing of aerosols, clouds, and atmospheric composition, as well as chemistry-climate modeling and inverse modeling of greenhouse gas emissions. In addition to lectures presented by five scientists, the training school participants completed data analysis exercises and group projects, using open-access tools and programming languages, involving satellite data and modeling focusing on Asian atmospheric pollution and regional monsoon climate.

The 3-day workshop represented four cross-cutting themes – (i) Field campaigns, modeling activities or satellite programs in the context of ACAM science, (ii) Aerosols/air quality characterization, aerosol-monsoon-climate interactions and feedbacks, (iii) Trace gas and greenhouse gas emissions – measurements, inventories, satellite observations and (iv) Chemistry-climate interactions and pollution transport to the upper troposphere/lower stratosphere (UTLS). There were 50 contributed talks delivered on these thematic topics, and 60 poster presentations and lightning talks. Altogether, participants represented 17 countries from Asia, Europe, the USA, and Australia, with 50 early-career researchers attending the workshop, thanks to the generous support from both longstanding and new sponsors of ACAM. Field campaigns, modeling activities, satellite observations, and measurement networks have always been integral components of the ACAM science and community. At the 2025 workshop, the modeling working group reviewed the various community modeling efforts at the intersection of composition, Asian monsoon, and reanalysis intercomparison projects. The workshop concluded with a panel discussion reflecting on the past 10 years of ACAM activities and accomplishments, as well as new opportunities and challenges in air pollution, chemistry, and Asian monsoon climate.