At a glance
Carbon monoxide fumes can be harmful or fatal. You cannot see or smell this gas.
Format: PDF
Language: English (US)
Last updated: August 31, 2026
Content Source
National Center for Environmental Health
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Published: May 15, 2024
Updated: April 19, 2024
This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.
Reviewed: April 24, 2024
The information on this page was last reviewed by subject matter experts to ensure accuracy.