Fig. 1. Measured and simulated emission rate of particulate matter with a mass median diameter 10 µm (PM₁₀), 8–9 June 2004 (54 pigs, average weight: 73 kg; mash feeding, ad libitum). Input variables: ventilation rate, animal activity, and animal weight (mean measured/simulated: 2.13/2.05; RMSE: ± 0.60; R²: 0.529)