Carbon Monoxide Danger Levels

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Carbon dioxide danger levels in your home begain to reach threatening levels around 70 ppm, or parts per million, according to the U.S. Consumer Product Safety Commission.

Normal Levels

  • The carbon dioxide, or CO level in households that contain gas stoves is 5 to 15 ppm, but this number may increase to over 30 ppm if the stove is not properly adjusted. Homes without gas stoves have CO levels of .05 to 5 ppm. A human can withstand prolonged exposure of up to 70 ppm before health problems occur, although heart patients may experience chest pain even at levels under 70 ppm.

Dangerous Levels

  • When the CO levels in a home hit a dangerous level, or over 70 ppm, flu-like symptoms will occur, such as fatigue, nausea, headache, dizziness and shortness of breath. Unlike the flu, CO poisoning will not present with a fever. When these symptoms occur, you must exit the home, find fresh air, and contact your local fire or police department. CO detectors will alarm at this level.

Lethal Levels

  • If a human is exposed to indoor CO levels between 150 to 200 ppm for a prolonged period of time, intoxication can be deadly. Warning signs include mental confusion, loss of consciousness, muscular coordination problems, vomiting and eventually death. Installing a CO detector in every bedroom of the house and in all interior hallways that lead to bedrooms can help prevent exposure to these lethal levels of CO.

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