My paper examines the effects of exogenous variation in particulate matter from the 2020 California wildfires on infant mortality. Drawing upon vital statistics datasets and national air quality data, I use a county-level differences-in-differences estimation while controlling for maternal age, demographic variables and median county income to obtain an exposure estimate of the effect of air quality for each trimester of exposure. Finally, I use satellite datasets from the EPA and US Forest Service to extract a more fine-grained estimate of county-level particulate and discuss robustness of results to modification of various specifications. (This research is ongoing, but should be finished by the end of April).