This is Carbon Monoxide Awareness Week in Ontario.
Fire officials say carbon monoxide is an invisible, odourless gas that can be deadly.
They say new alarm requirements took effect in Ontario this year to help keep households safe.
CO alarms are required in homes with a fuel-burning appliance, such as a furnace or gas stove, a fireplace or an attached garage.
They are also required in homes heated from air supplied by a fuel-burning appliance located outside the home, such as a furnace in a detached shed.
The alarms must be installed outside each sleeping area and on every storey of the home.
