A high resolution spatiotemporal fine particulate matter exposure assessment model for the contiguous United States

The model achieved leave-one-location-out cross validated median absolute errors of 0.99, 0.76, 0.63, and 0.60 μg m3 for weekly, monthly, annual, and all-time exposure assessments, respectively. We further describe the model’s cross validated performance at different geographic regions in the United States, finding that it performs worse in the Western half of the country where there are less monitors.