A wireless environmental monitoring system is disclosed comprising at least one monitor unit in wireless communication with a remote monitoring centre by way of the Internet and a server unit wherein the server unit is in wireless communication with both the monitor unit and the remote monitoring centre. The monitor unit comprises at least one sensor configured to detect an anomalous environmental condition such as the presence of or undesirable change in environmental variables. The monitor unit further comprises an alarm system and a relay output wherein the relay output is configured to trigger an event in response to the anomalous environmental condition to mitigate damage that may be caused by the anomalous environmental condition. The remote monitoring centre is configured to receive and monitor the operational parameters of the monitor unit to interpret an anomalous environmental condition detected by the monitor unit in light of operational variations which may affect the accuracy of the monitor unit. The remote monitoring centre is also configured to receive and communicate environmental data to the monitor unit to establish the base threshold level used to determine an anomalous environmental condition.