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Carbon monoxide is a colorless, odorless, tasteless gas that is released by gas furnaces, propane stoves, charcoal grills, cars and portable generators. Most carbon monoxide poisonings occur in the winter and to the elderly. Because the symptoms of carbon monoxide poisoning include headache, dizziness, lightheadedness and nausea, people don't often realize that poisonous gas is the cause of their complaints.