In this work we study the diffusion of a toxic gas in a public tunnel due to an explosion in order to realize a control system - via a wireless network of active sensors identification and immediate containment procedures. To this end a single suction pump is turned on instantaneously at a distance of b meters from the explosion to mitigate the effects of the terroristic act. We find exactly the diffusion concentration in order to provide a solution useful for comparison to other models with many pumps suction. The model is described by the diffusion PDE with a non-homogeneous term which models the suction pump.
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