Aerobiology is the science of life in the atmosphere. Beyond animals capable of flight, the atmosphere is host to significant microbial life, as spores, on dust particles, and within fog and cloud water.  These airborne microbes have substantial regional and global impacts, affecting aerosol composition, ice and cloud nucleation, health and agriculture, and biodiversity.  Advances in aerobiology are enabled by innovation in areas including sample capture (balloons, aircraft, rocketry, drones, fog collectors); sample analysis (low-biomass detection, nucleation studies, phylogenetic classification, functional genomics); and integration with remote sensing and climate and ecosystem modeling (dust trajectories, aerosol lifetimes, biodiversity, habitability). This session seeks diverse contributions covering all areas of aerobiology, including new field observations, sampling platforms or strategies, laboratory experiments, theoretical modeling, and Earth's atmosphere as an analogue for other worlds. Studies that integrate multiple types of data, or observations across spatial and temporal scales, are particularly encouraged.