This session brings together different scientific communities working on volcanic plumes and their impacts at all time-scales, from the first evolution of ash-rich volcanic plumes to the volcanic sulfate aerosol that lingers in the atmosphere for years after an eruption. Generally, volcanic plumes start as ash-rich and evolve into mostly sulfate plumes after the deposition of ash particles. Volcanic Ash Advisory Centers monitor ash plumes on hours-to-weeks timescales to limit their impact on aviation. Climate studies mostly focus on the evolution of volcanic sulfate and its years-long impacts on atmospheric composition and radiation. In this session, we welcome submissions of observational and modeling studies on any stage of volcanic plumes, from the early ash-rich phase to late sulfate plumes. We also welcome submissions on the impacts of volcanic perturbations at different scales, from local communities, to aviation, to the global atmosphere and climate.