Which gas is NOT typically released during a fire?

The identification of ozone as the gas not typically released during a fire is rooted in the properties of ozone and the combustion process. Ozone (O3) is a molecule that exists in the Earth's atmosphere and is produced through photochemical reactions involving sunlight, particularly in urban environments where pollution is present. In contrast, the gases that are typically released during combustion, such as acrolein, hydrogen chloride, and carbon monoxide, are byproducts of burning organic materials and certain chemicals.

During a fire, organic materials like wood, plastics, and other combustible substances release a variety of gases as they burn. Acrolein is a toxic compound that can be generated from the combustion of organic matter. Hydrogen chloride is often produced when chlorine-containing materials, such as certain plastics, burn. Carbon monoxide is a byproduct of incomplete combustion, which is common during many types of fires where there may not be sufficient oxygen for complete oxidation of the fuel.

In summary, while ozone is a significant atmospheric molecule and has implications for air quality and pollution, it is not a typical product of fire compared to the other three gases mentioned. Thus, ozone is considered the correct answer because it is not commonly released during the combustion process that occurs in fires.