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What are signs of carbon monoxide poisoning?

Short answer

Headache, dizziness, nausea, weakness and confusion, often in several people at once. Get out and call 911. Install CO alarms near bedrooms.

Rules differ by state. This is general information, not legal or professional advice.

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Official sources

Energy Saver (U.S. Dept. of Energy)energy.gov
CDC: carbon monoxide safetycdc.gov
Ready.gov: extreme heat and winter weatherready.gov