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Firefighters must learn the proper procedures for responding to residential carbon monoxide (CO) emergencies. Upon arriving at the scene of the alarm, personnel shall put on protective clothing and then bring an operational, calibrated CO meter onto the premises. Occupants of the premises shall then be examined. If they are experiencing CO poisoning symptoms i.e., headaches, nausea, confusion, dizziness, and other flu-like symptomsan emergency medical services (EMS) crew shall be notified immediately and the occupants evacuated and administered oxygen. To test for CO contamination, meters must be held head high. Appliances should be operating for five to ten minutes before testing, and a check must be made near all gas appliances and vents. If vents are working properly, no CO emissions will enter the structure. If the meters register unsafe levelsabove 10 parts per million (ppm) all occupants shall be evacuated and the source of the contamination investigated. Occupants shall be interviewed to ascertain the location of the CO detector (if any), the length of time the alarm has sounded, what the occupants were doing at the time of the alarm (cooking, etc.), and what electrical appliances were functioning. Occupants shall not re-enter the premises until the environment is deemed safe. If the meters register levels lower than nine ppm, occupants shall be allowed to re-enter the building. They shall be notified of the recorded level and given a CO informational packet.
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