Boating Coach
Emergencies and cold waterQuestion 264 of 566

What is true about carbon monoxide (CO)?

  1. It has a strong smell of gas.
  2. It is a green gas you can see.
  3. You cannot see, smell or taste it.
  4. It tastes sour.
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Correct answer: You cannot see, smell or taste it.

CO gives no warning to your senses, so it is very dangerous.

Source: Safe Boating Guide (TP 511E, 2026), Be aware of carbon monoxide dangers, page 34

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Questions last reviewed: 18 October 2026