We work on improving understanding of, and informing mitigation efforts related to, particulate matter air quality (PMAQ) in and around Borrego Springs, CA. We monitor PMAQ using satellite-based retrievals of surface dust, five UCI automatic weather stations that have measured PMAQ in 10-minute intervals since 2016, as well as one portable monitoring device. Satellite-retrieved estimates of PMAQ show a steady degradation of air quality in Borrego since the early 1980s. The station measurements show no PMAQ exceedances relative to EPA standards since 2016. Continued monitoring will extend these time series and ease identification of any gross changes due to altered land use practices upwind of the stations, including fallowing, construction, and off-road activities. We model PMAQ using the Weather Research and Forecast (WRF) modeling system. Our simulated winds closely agree with the measurements. However, the simulated dust concentrations are unrealistically high and variable, possibly caused by poor representation of the elements (pebbles, rocks, and bushes) that shield the soil from the wind and thus inhibit dust emission. We collaborate with UC Riverside to understand and address these biases. We attribute dust sources using the WRF simulations. Once the model biases are reduced to a reasonable level, we will turn on and off potential dust source regions to quantify the source-receptor relationships between each source region and each UCI station.