Asphyxiating gas is a term commonly used to describe gases that can cause suffocation or death. Some common synonyms for this term include toxic gas, poisonous gas, lethal gas, suffocating gas, and noxious gas. These gases can be released naturally from sources like volcanoes or from human-made sources like chemical factories and can be highly dangerous if inhaled. Asphyxiating gases can affect the body's ability to transport oxygen, causing symptoms like dizziness, nausea, seizures, and even death. It is important to take necessary precautions when working with or around potentially asphyxiating gases to prevent any harm or injury to oneself and others.