Each year, firefighters race to calls about victims overcome by the toxic gas. In most cases, the families used outdoor heating or grilling appliances inside their homes to stay warm. People have even gone to the extreme lengths of bringing barbeque's and propane woks into their homes as portable heaters, not only creating the possibility of Carbon Monoxide poising but also a fire hazard. 

According to the California Environmental Agency, 30 to 40 people die from carbon monoxide poisoning on average each year. The gas is known as "the silent killer."  Carbon Monoxide is a colorless odorless gas. At moderate levels, a person may have severe headaches, become dizzy, mentally confused, nauseated, or faint. You can even die if these levels persist for a long time. Low levels can cause shortness of breath, mild nausea, and mild headaches, and may have longer term effects on your health.

Since many of these symptoms are similar to those of the flu, food poisoning, or other illnesses, you may not think that Carbon Monoxide poisoning could be the cause. To prevent carbon monoxide poisoning, experts suggest:--Never use barbecue grills, portable gas camp stoves or burn charcoal indoors. --Check all gas appliances to see if they are working correctly. --Clean heating systems every year including fireplaces, furnaces, flues and wall heaters. --Common symptoms of exposure include dizziness, nausea, headaches or sudden fatigue. --If you are feeling sick, get out of the house and immediately call 911.