Carbon monoxide (CO) is a colorless, odorless, and poisonous gas, which can be deadly. The Consumer Product Safety Commission reports that more than 150 people in the United States die each year from CO poisoning. The commission goes on to recommend that consumers do the following: have annual heating system inspections, never use portable generators indoors, never use an oven for heating, install battery-operated CO alarms, and know the symptoms of CO poisoning.
Consumer Product Safety Commission, March 2019