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What makes carbon monoxide especially dangerous?

You cannot see or smell it.

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  1. It always smells like rotten eggs
  2. You cannot see or smell it ✔
  3. It only forms outdoors

Why: CDC says carbon monoxide is an odorless, colorless gas that kills without warning. A CO alarm is how you know it is there.

Huh, didn't know that: CPSC recommends interconnected CO alarms, so when one sounds, they all sound.

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References

Answer: You cannot see or smell it. CDC says carbon monoxide is an odorless, colorless gas that kills without warning. A CO alarm is how you know it is there.

  1. CDC: About Carbon Monoxide www.cdc.gov/carbon-monoxide/about/index.html
    Carbon monoxide (CO) is an odorless, colorless gas that kills without warning.
    Checked 2026-10-10.

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