Carbon monoxide
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If a CO alarm sounds or carbon monoxide exposure is suspected, get everyone into fresh air immediately and call emergency services. Do not stay inside to find the source. Headache, dizziness, nausea or confusion can be warning signs.
Take it with you. Verify locally.
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In immediate danger, contact local emergency services. Current instructions for your location take priority.
Do now.
- 01
Leave the building
Move people and pets into fresh air, without delaying to ventilate or troubleshoot.
- 02
Call from outside
Report the alarm, symptoms and possible fuel-burning source to emergency services.
- 03
Get medical help
Tell responders about suspected exposure even if symptoms improve outdoors.
- 04
Wait for clearance
Do not reenter until responders say it is safe.
Next steps.
Install CO alarms and service heating equipment. Keep generators and grills outdoors, far from openings.
Watch for.
CO is invisible and odorless. A silent smoke alarm is not proof that air is safe.
Sources & context.
Original Osprey Zero summary of the references below. U.S.-based guidance unless noted; check authorities where you are. This page is not a live alert.
Updated 2026-10-02. Recheck official instructions during an active event.