Evaluating the emissions and chemistry of understudied VOC sources using observations from field and laboratory studies.

Oxygenated volatile organic compounds (oVOCs) emitted from non-vehicular sources, such as volatile chemical products (VCPs) and cooking, are important contributors to the total anthropogenic VOCs observed in urban regions. Models typically underrepresent oVOC emissions compared to observations and the chemical reactions that describe oVOC oxidation are often missing or misrepresented in chemical mechanisms. Here, we present multi-year efforts to update atmospheric models to better reflect the emissions and chemistry of oVOC sources. We leverage measurements from multiple ground campaigns to update emissions inventories, then use models with updated oVOC chemistry to understand how these emissions react in the atmosphere. We compare these observations to laboratory simulations of urban air conducted in the SAPHIR chamber during the Household Chemicals Amplifying Urban Aerosol Pollution (CHANEL) experiment. We demonstrate how we are using these models to better understand the detailed chemical measurements conducted in urban areas during the 2023 Atmospheric Emissions and Reactions from Megacities to Marine Areas (AEROMMA) aircraft campaign. We will discuss what implications these updates may have on model simulations of ozone production in megacities like Los Angeles, CA.