The model accounts for indoor chemistry (e.g., sorption to indoor surfaces, gas-particle partitioning, and reaction with OH radical) and various transport and removal processes (e.g., removal via vacuum cleaning, ventilation, deposition, and resuspension). The model simulates the concentrations of organic compounds in various indoor compartments (e.g., gas phase, airborne particles, dust, carpet, vinyl flooring, and walls).
The model includes four compartments that capture the major indoor reservoirs for chemicals – air, carpet, vinyl flooring, and walls. Each compartment in the model is comprised of multiple phases, such as gases and particles in the air compartment. A set of differential equations accounts for gains and losses in each compartment as well as transfers between compartments.