A biosensor unit that can be wall mounted in a location to perform testing of ambient air for bio-contaminants. This unit could contain an air filter for collecting contaminants and a micro-laboratory on a chip or otherwise situated within the unit to perform DNA or RNA binding tests for specific biological targets. Information from such units distributed within an environment could be communicated to one or more central locations via the internet or other communication means to be logged or recorded or to produce reports or alarms.