More than half of the deaths are from malfunctioning or improperly vented combustion appliances such as gas and propane heaters and furnaces, and hibachis. One third of the deaths are from accidental exposure to motor vehicle exhaust.
Carbon monoxide is a colorless, odorless gas that results from burning fuels.
Each winter we hear of tragic accidents that occur when people are exposed to lethal levels while using poorly vented or leaking stoves, fireplaces and furnaces for heating. Exposure to lower levels of CO can cause headaches, nausea, or heart pain. Those most susceptible include infants, small children, the elderly and heart and respiratory patients. CO poisoning cases are under-diagnosed and often go unrecognized by the victims and their doctors. ARB data shows that carbon monoxide levels rise throughout California between November and March because the compound tends to disperse more slowly in cool temperatures.