A monitoring system having an ad-hoc network of wireless sensor stations. Each sensor station is provided with one or more sensors suitable for monitoring one or more physical parameters of interest and collecting information. The sensor stations are configured to process the collected information using appropriate distributed computational algorithms such that nearby sensor stations can exchange information with each other in the ad-hoc network to evaluate the situation in a specific location at a specific moment in time employing combined information of the nearby sensor stations in the area. The information is transmitted via the ad-hoc network to information consumers only if necessary, based on the evaluation.