No, carbon monoxide cannot smell like natural gas because carbon monoxide is an entirely odorless, colorless, and tasteless gas that cannot be detected by human senses. Natural gas and propane have no natural scent either, but utility companies deliberately add a harmless chemical odorant called mercaptan—which smells distinctly of sulfur or rotten eggs—so that people can detect even minor leaks. Because carbon monoxide lacks this added odorant, it cannot be smelled, making it a silent and deadly hazard. If you ever suspect a gas leak because of a sulfur smell, evacuate immediately, but keep in mind that a lack of odor does not mean carbon monoxide is absent, which is why installing certified carbon monoxide detectors on every level of your home is critical for safety.
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