Day 5 – Carbon Monoxide Alarms Holiday safety starts with carbon monoxide alarms. Carbon monoxide is invisible and odourless — you can’t see it, you can’t smell it, but it can be deadly. A working CO alarm is the only way to protect your family from this silent threat, especially during the winter months when fuel-burning appliances are used more often. Protect your home by following these safety steps: • Install CO alarms outside all sleeping areas and on every storey of your home. • Test alarm