No, a rotten egg smell does not mean carbon monoxide. Carbon monoxide is an extremely dangerous, toxic gas that is completely odorless, colorless, and tasteless, making it impossible to detect without a dedicated electronic carbon monoxide detector. Conversely, utility companies deliberately add a pungent chemical compound called mercaptan to natural gas and propane, giving them a distinct rotten egg or sulfur smell specifically so gas leaks are easily detectable. Callout type="warning" title="Safety Warning": Never rely on smell to detect carbon monoxide; install certified CO detectors on every level of your home. Verification: Test carbon monoxide detector batteries regularly to ensure household safety.
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