A central focus in our research program is atmospheric particulate matter (aerosols) and their impacts on atmospheric processes that impact clouds, climate, air quality and biogeochemical cycles. Studies often integrate observations, theory and modelling to fully understand the full range of effects of particulate matter. We are involved in the development of aerosol instrumentation, and measurement techniques required to study processes and constrain parameters. Our group and collaborating partners develop open-source modules routinely used in air quality and climate models, as well as tools for advanced sensitivity analysis of large codes and model reduction/data discovery through emulation and network analysis. We are also heavily involved in field measurement programs on understanding the climate and health impacts of ambient aerosol. LAPI continuously expands into other areas of research and is involved in a number of exciting exploratory projects.