If summer plans include camping and you want heat inside your tent or camper, use one of the new portable heaters that are equipped with an oxygen depletion sensor (ODS). If oxygen levels start to fall inside your tent or camper, the ODS automatically shuts down the heater before it can produce deadly levels of carbon monoxide (CO). Do not attempt to use alternative sources of heat or power to warm a tent or camper. Traditional camping heaters, charcoal grills, camping lanterns, and gas generators also can cause CO poisoning.