Probabilistic safety analysis for urgent situations following the accidental release of a pollutant in the atmosphere

Accidental toxic release in a built environment - risk map (at 1.5 m above the ground level) emphasizing the safe (risk is less than 2.5%), dangerous (risk is greater than 97.5%) and uncertain zones (risk is comprised between 2.5% and 97.5%), estimated using Monte Carlo sampling with 10,000 runs of the vector GP surrogate model. The orange line corresponds to the median critical toxic load contour level while the black line corresponds to that obtained from the deterministic risk assessment study.145