Install and test carbon monoxide alarms at least once a month

CO is called the “Invisible Killer” because it’s a colorless, odorless, poisonous gas. Breathing in CO at high levels can be fatal.

Know the symptoms of CO poisoning

Source: Consumer Product Safety Commission

Because CO is odorless, colorless, and otherwise undetectable to the human senses, people may not know that they are being exposed. The initial symptoms of low to moderate CO poisoning are similar to the flu (but without the fever). They include:

• Headache
• Fatigue
• Shortness of breath
• Nausea
• Dizziness

High level CO poisoning results in progressively more severe symptoms, including:

• Mental confusion
• Vomiting
• Loss of muscular coordination
• Loss of consciousness
• Ultimately death