The Carroll Fire Chief wants to remind residents to check carbon monoxide (CO) detectors after a close call on Wednesday. According to the report, the fire department responded to a call at approximately 11:30 p.m. to a home in northern Carroll that was registering 50 parts per million (ppm) of CO. The World Health Organization (WHO) recommends indoor CO levels be no greater than nine ppm for eight hours, and individuals should not be exposed to anything greater than 25 ppm for longer than an hour. While no one was reported to have any severe side effects, Carroll Fire Chief Dan Hannasch stresses the importance of early detection. He recommends getting a CO detector on every house level and checking the batteries frequently. Residents should also have a professional company come in to check for proper ventilation in the furnace and any fuel-burning appliances. Taking these simple steps, Hannasch says, can significantly reduce your risk of CO poisoning and keep your household safe.