The USEPA Stochastic Human Exposure and Dose Simulation (SHEDS) Model for PM

The U.S. federal government has created an in-house exposure simulation model for particulate matter with sophisticated sampling features.

From the paper abstract: "The US EPA National Exposure Research Laboratory (NERL) has developed a population exposure and dose model for particulate matter (PM), called the Stochastic Human Exposure and Dose Simulation (SHEDS) model. SHEDS-PM uses a probabilistic approach that incorporates both variability and uncertainty to predict distributions of PM exposure, inhaled dose, and deposited dose for a specified population."