Dangerous levels of carbon monoxide -- a colorless and odorless gas -- can be produced from improperly vented furnaces, plugged or cracked chimneys, water heaters, fireplaces, stoves, and tail pipes. Any vehicle or appliance that burns fuel may emit carbon monoxide.
Hundreds of people die from carbon monoxide poisoning every year, and thousands of others suffer dizziness, severe headache, and nausea.
People with carbon monoxide poisoning often report feeling sick and having feelings of malaise which continue to worsen. The most common symptom of carbon monoxide poisoning is headache. However, symptoms may also include dizziness, chest pain, nausea, and vomiting. In severe cases, people can become increasingly irritable, agitated and confused, eventually becoming lethargic and lapsing into unconsciousness. Everyone is at risk, however, people with low red blood cell counts, heart or respiratory ailments, as well as infants are at higher risk.