Where does carbon monoxide in the home come from?

Carbon monoxide sources include: Heaters, fireplaces, furnaces, appliances, and cooking sources that use coal, wood, petroleum products, and other fuels. Petroleum products include, but are not limited to, kerosene, natural gas, and propane. Equipment powered by internal combustion engines, such as cars, portable generators, lawnmowers, and power washers, emit carbon monoxide. Attached garages with doors, ductwork, or ventilation shafts that are connected directly to a living space are also considered "carbon monoxide sources".

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1. What is carbon monoxide?
2. Why is carbon monoxide harmful?
3. Where does carbon monoxide in the home come from?
4. What is a carbon monoxide alarm?
5. Are carbon monoxide alarms required in existing, owner-occupied single-family homes and duplexes?
6. What are landlord / tenant responsibilities?
7. Where in the home should carbon monoxide alarms be installed?
8. Do current rules require carbon monoxide alarms on all levels of the home?
9. What are acceptable power sources for carbon monoxide alarms?
10. What are the maintenance requirements for carbon monoxide alarms?
11. What should people do when the carbon monoxide alarm sounds?