Diffusion of a generic contaminant in Milan

The following video shows the transport and the diffusion of a generic contaminant in the city of Milan.

We simulated a massive release of a contaminant that took 20 seconds.

We then followed the contaminant dispersion carried out by a north wind of 3 meters per seconds, for 380 more seconds.

The orange and the pale blue clouds show the concentrations of 10 milligrams and 1 microgram per cubic meter respectively.