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What if you fall a sleep in garage and your car is still running can the fumes kill you?

Yes, the fumes from a running car in a closed garage can kill you. Carbon monoxide (CO) is a colorless, odorless gas that is produced when fuel burns. CO binds to hemoglobin in the blood, preventing oxygen from being transported to the body's organs and tissues. CO poisoning can cause headaches, dizziness, nausea, vomiting, confusion, and loss of consciousness. At high levels, CO can cause death.

The concentration of CO in a garage with a running car can quickly reach dangerous levels. In one study, the CO concentration in a garage with a running car reached 1,000 parts per million (ppm) within 10 minutes. The National Institute for Occupational Safety and Health (NIOSH) recommends that the CO concentration in workplaces not exceed 50 ppm.

If you fall asleep in a garage with a running car, you may not be able to wake up before CO poisoning occurs. It is important to never leave a car running in a closed garage, even for a short period of time.