Like Carbon Monoxide is an odorless, TOXIC gas that is produced when fuels such as gasoline, wood, coal, or natural gas are burned. It is a colorless and tasteless gas that can be deadly in high concentrations. It is important to be aware of the dangers of this gas, as it can cause serious health problems if inhaled. The two crossword solutions for this term are ODORLESS (8 letters) and TOXIC (5 letters).