Carbon monoxide (CO) is a colorless, odorless gas that can be harmful when inhaled. It is produced by burning fossil fuels, such as in cars, heaters, and stoves. Because it is difficult to detect without special equipment, it can accumulate in enclosed spaces, leading to poisoning. When inhaled, carbon monoxide binds to hemoglobin in the blood more effectively than oxygen, reducing the blood's ability to carry oxygen to vital organs. Symptoms of CO poisoning include headaches, dizziness, and confusion. To prevent exposure, it is important to ensure proper ventilation and use carbon monoxide detectors in homes.