Carbon Monoxide Poisoning
Carbon monoxide (CO) is an odorless, colorless, deadly gas. It can kill you before you know it because you cannot see it or smell it.

Carbon monoxide can be formed when your appliances are not buring properly.

Symptoms of CO poisoning: Flu like symptoms - headaches - drowsiness - nausea - blurred vision

If you think you have CO poisoning, go outside into fresh air. If needed, get medical attention.