In which quantity is carbon monoxide considered particularly deadly?

Carbon monoxide (CO) is particularly deadly in small amounts because it is a colorless, odorless gas that can lead to poisoning without any immediate warning signs. CO binds with hemoglobin in the blood much more effectively than oxygen does, which can result in hypoxia, or a lack of oxygen getting to vital organs, even at lower concentrations.

Symptoms of carbon monoxide poisoning – such as headache, dizziness, weakness, and confusion – can occur at relatively low exposure levels. When individuals are exposed to CO, they may not realize they are being poisoned until it's too late, which underscores its danger, even in small quantities.

A common misconception might be that only large amounts are hazardous, but given CO’s properties, it can quickly become lethal in limited quantities, especially in enclosed spaces where ventilation is poor. Awareness of the risks associated with even small amounts of carbon monoxide is crucial for safety in environments where gas appliances are used.