A Carbon Monoxide Alarm Needs Action Even Without a Smell
Odor & SweatArticleCarbon monoxide is odorless. Leave immediately if its alarm sounds.
In this article
Act when the alarm sounds
If your carbon monoxide detector alarm sounds, leave your home immediately and call 911 in the United States, or your local emergency number elsewhere. CDC’s1 January 2018 statement gives the leave-and-call instruction.1
No smell does not mean no carbon monoxide
Carbon monoxide is an odorless, colorless gas. CDC’s2 January 2026 guidance explains that it can cause sudden illness and death when inhaled. You cannot use the absence of a smell to dismiss a carbon monoxide alarm.21
Check prevention arrangements beforehand
CDC2 recommends battery-operated or battery-backup carbon monoxide detectors near every sleeping area. Follow the manufacturer’s replacement instructions.2
Arms Up includes a visit script. Use it to organize health questions for your care team. Explore the sweat and odor playbook.
This article is for general educational purposes only and is not medical advice. It isn't a substitute for diagnosis or treatment from a qualified healthcare professional who knows your health history. Please don't ignore professional advice or delay getting care because of something you read here. If you think you may be having a medical emergency, call 911 or your local emergency number right away. Girl Playbook does not endorse any specific product, test, or provider.
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Sources
The research behind this article, in the order it’s cited. How we source our articles.
- Centers for Disease Control and Prevention, 2018Avoid Carbon Monoxide Poisoning: Stay Safe While Staying Warm (opens in a new tab)abc
- Centers for Disease Control and Prevention, 2026Carbon Monoxide Poisoning Basics (opens in a new tab)abcd
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