What makes carbon monoxide gas particularly dangerous on board?

• A. It is colorless, odorless, tasteless, and fatal
• B. It is heavy and sinks boats
• C. It has a distinct smell
• D. It can be found only in diesel exhaust

Answer: (D)

Carbon monoxide is dangerous on a boat because it is colorless, odorless, and tasteless, so you can’t detect it without a device. It binds strongly to hemoglobin in your blood, forming carboxyhemoglobin, which prevents your blood from carrying oxygen. Even small exposures can cause dizziness, headaches, confusion, fainting, or death, especially in enclosed or poorly ventilated spaces where exhaust from engines, generators, or other fuel-burning appliances can accumulate. It's not limited to diesel exhaust and it doesn't have a smell, so relying on senses is unreliable. Using marine-grade CO detectors and ensuring proper ventilation and exhaust venting for all fuel-burning equipment are essential safety measures.