Never leave an automobile running in an attached garage because carbon monoxide levels may rise in rooms above. To minimize or prevent airflow into adjacent rooms, the door from the house to the garage should be airtight and there should be no openings in the garage ceiling. Health effects of breathing carbon monoxide range from fatigue in lower concentrations to dizziness, nausea, confusion and death in higher concentrations.
| Storage-of-Chemicals/Fuels | Car Exhaust |
| Living Room || Kitchen || Bedroom || Bathroom || Garage || Basement || Attic || Home |