Sponsored by two U.S. Department of Energy scientific user facilities—ARM and the Environmental Molecular Sciences Laboratory (EMSL)—and the Atmospheric System Research program, this summer school will be held at Pacific Northwest National Laboratory in Richland, Washington. Up-and-coming atmospheric scientists interested in the finer points of aerosols will learn about aerosol formation, characterization, forcing properties, and climate impacts. Instructors include ARM and EMSL users and staff from Pacific Northwest and Brookhaven national laboratories.