As The Mercury Continues To Dip, Some Families Are Turning On Their Kitchen Stove Burners And The Oven To Take The Chill Off Their Home. However Sam Mcclain, Assistant Fire Marshal For Johnson City, Said The Practice Can Be Very Dangerous Because A Gas Oven Or Range Produces Carbon Monoxide. Often Called A Silent Killer, Co Is An Invisible, Colorless Gas. Everyone Is At Risk For Co Poisoning, But Infants, Pregnant Women, And People With Physical Conditions That Limit Their Ability To Use Oxygen Such As Emphysema Can Be More Severely Affected. Mcclain Advises Homeowners To Install Co Alarms Inside Their Homes, And Test The Alarms At Least Once A Month.