What Is a Normal Home Carbon Monoxide Level?

The U.S. Environmental Protection Agency says that the average level of carbon monoxide in a home without a gas stove is between 0.5 and five parts per million. The level of carbon monoxide near a properly adjusted gas stove is five to 15 parts per million.

The U.S. Occupational Safety & Health Administration’s permissible exposure limit for carbon dioxide is 50 parts per million. An average of 170 people in the United States die each year due to carbon monoxide produced by non-automotive consumer products, according to the U.S. Consumer Product Safety Commission. These products include portable generators, charcoal, fireplaces and malfunctioning fuel-burning appliances, including water heaters, furnaces and ranges.