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Carbon monoxide from engine exhaust has what color and odor?

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  1. Pale yellow, smells like gas
  2. Slightly green with a sweet smell
  3. Colorless and odorless

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References

  1. FAA AIM 8-1-4 Carbon Monoxide Poisoning in Flight www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html Checked 2026-10-10.
  2. FAA AIM 8-1-4 Carbon Monoxide Poisoning in Flight www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html Checked 2026-10-10.

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