This accessible poster (from the "Understanding" series) reminds readers that carbon monoxide is a gas that has no smell, is invisible, and can be deadly. It lists the precautions to take to prevent poisoning: maintaining heating appliances, following the instructions for heating appliances, using fire pits, barbecues, and generators outdoors, and ventilating your home for at least ten minutes a day. It directs readers to the website prevention-maison.fr for more information.