Which harmful gas is commonly a product of combustion in fires?

The commonly encountered harmful gas produced from combustion in fires is carbon monoxide. This gas is a colorless, odorless byproduct that forms when carbon-containing materials do not completely burn. During a fire, especially in conditions where there is limited oxygen, incomplete combustion leads to a higher concentration of carbon monoxide, which poses significant health risks, including poisoning and potentially fatal outcomes.

While hydrogen cyanide and other gases like formaldehyde and sulfur dioxide can also result from specific materials burning, carbon monoxide is far more prevalent in typical fire scenarios. Its presence is especially dangerous because it can lead to rapid health deterioration for those exposed, as it interferes with the blood's ability to carry oxygen. Understanding the nature and prevalence of carbon monoxide in fire situations is crucial for fire safety and response protocols.