Atmospheric aerosols originate from multiple natural and anthropogenic sources, and their emission strengths depend strongly on a combination of biological, geologic, human, and meteorological factors. Current studies show that these aerosol mixtures can have strong impacts on human health, ecosystems, global climate, and weather. It is important to understand these complex aerosol mixtures including their chemical make-up, biological implications, and physical properties, as well as their distribution, fate, and transport in the atmosphere. Challenges remain with respect to model verification of aerosol distributions and aerosol properties. This session solicits presentations of research studies on naturally occurring aerosols; e.g., mineral dust, wildfire smoke, sea salt, pollen, and biogenic particles, with a focus on multidisciplinary efforts that investigate their emissions strength, source properties, physical complexity and mixtures, chemical transformations, and transport. Presentations that discuss the novel advances in measurement, modeling and analysis of naturally occurring aerosols including the characterization of the composition of aerosol mixtures, quantifying emission strength, understanding transport and photochemical evolution, and estimating their weather, climate, ecological, or health & safety implications are also invited. Through this session, we hope to catalyze discussions on the chemistry, physics, and biology of aerosols from emissions to impacts.