Summary: Dearborn Fire and Police responded to a carbon monoxide (CO) alarm at 3360 Polk in Wayne County, Michigan. The caller reported the CO alarm was sounding and that a male resident in the basement was unresponsive to attempts at contact. Multiple units, including Engine 2 and Car 7, were dispatched. Police were also sent due to the potential medical emergency. Upon investigation, it was determined that the male resident had simply returned home and there was no hazard. Engine 2 cleared the scene and returned to service.