Call for medical assistance and until it arrives, keep those exposed lying down and keep them warm by wrapping them in blankets. Rest is absolutely necessary. Those exposed should not be allowed to walk for several hours after regaining consciousness. Mild headache, few other symptoms Headache after 1-2 Hours Headache after 45 minutes, nausea, collapse, and unconsciousness after 2 hours Dangerous, unconsciousness after 1 hour Headache, dizziness, nausea after 20 min. Headache, dizziness, nausea after 5 min.
Carbon monoxide is a by-product of combustion, present whenever fuel is burned.
In fact, one of the major causes of carbon monoxide build up in the home is poor draft from fuel burning appliances. This means that the products of combustion are not being safely carried outside. Instead, they are backing up into the house. Carbon Monoxide is produced by common home appliances, such as gas or oil furnaces, gas refrigerators, gas clothes dryers, gas ranges, gas water heaters or space heaters, fireplaces, charcoal grills, wood burning stoves and believe it or not, cigarette smoke. Fumes from automobiles and gas powered lawn mowers also contain carbon monoxide and can enter a home through walls or doorways if an engine is left running in an attached garage.