Carbon monoxide is a very toxic gas that is odorless, colorless, and tasteless.
The symptoms of carbon monoxide poisoning are often confused with those of influenza and the highest incidence of poisoning occurs at the onset of cold weather or during flu season. For these reasons, the best way to detect it is with a blood test. Lack of adequate heating equipment ventilation. Indoor use of barbecue grills. Use of cooking appliances for heating purposes.