The 12th International GEOS-Chem Meeting (IGC12) was held at Washington University in St. Louis (Missouri, USA) on June 9-12, 2026 with 259 registrants from 106 institutions and 20 countries. Model clinics were held on June 8. Follow the links for:

• Oral and poster presentations from the meeting;
• Model development priority list coming out of the meeting.

We are grateful for the financial support for the meeting offered by NASA, NSF, EPRI, the Schmidt Family Foundation, and the Washington University in St. Louis James McKelvey School of Engineering, Center for the Environment, and McDonnell International Scholars Academy.

We look forward to seeing you at the 13th International GEOS-Chem Meeting.

The GEOS-Chem Steering Committee