Turn off and unplug all lights and decorations before going to bed or leaving your house. Buy electrical decorations that have been approved by a national testing laboratory. Avoid overloading outlets. CO results from the incomplete burning of natural gas, oil, wood, kerosene, charcoal and other fuels, under conditions where there isn't enough oxygen present. Exposure to low levels of CO can cause flu-like symptoms, such as headaches, nausea, dizziness, drowsiness, weakness, and shortness of breath.
Higher levels can result in unconsciousness or death.
People most vulnerable to the effects of CO include pregnant women, the elderly, small children, people with lung problems or other chronic health conditions, and people engaging in strenuous physical activity. To protect yourself and your family against CO, make sure your heating system and all fuel burning appliances are adequately vented and properly maintained. Make sure your furnace has an adequate air intake. Provide adequate ventilation when using fireplaces, wood stoves or space heaters. Don't use gasoline engines or burn charcoal in enclosed spaces.