In the bifurcated approach, safety processor 430 can serve as the “brain stem” of hazard detection system 400 and system processor 402 can serve as the “frontal cortex.” In human terms, even when a person goes to sleep (i.e., the frontal cortex is sleeping) the brain stem maintains basic life functions such as breathing and heart beating. Comparatively speaking, safety processor 430 is always awake and operating; it is constantly monitoring one or more of sensors 422-427, even if system processor 402 is asleep or non-functioning, and managing the sensor state machines of hazard detection system 400. When the person is awake, the frontal cortex is used to processes higher order functions such as thinking and speaking. Comparatively speaking, system processor 402 performs higher order functions implemented by system state machines 404, alarm/speaker coordination module 406, hush module 407, trigger adjustment module 410, and alarm/pre-alarm threshold setting module 412. In some embodiments, safety processor 430 can operate autonomously and independently of system processor 402. Thus, in the event system processor 402 is not functioning (e.g., due to low power or other cause), safety processor 430 can still perform its hazard detection and alarming functionality.