A method and apparatus for detecting hazardous gases. The method includes the steps of providing a central station and a plurality of environmental detectors within a protected area, each of the plurality of environmental detectors detecting environmental events within the protected area and reporting detected events to the central station, one of the plurality of environmental detectors detecting an environmental event within the protected area and reporting that event to the central station, the central station determining a location of the detected event and of each of the plurality of environmental detectors within the protected area, the central station dynamically computing a route from the determined location of each of the plurality of environmental detectors to the closest and safest exit based upon the determined location of the detected environmental event and the central station generating and sending a respective map showing the computed route to the closest and safest exit for that environmental detector to each of the plurality of environmental detectors.