The Silent Killer: Sounding the Alarm on Carbon Monoxide
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October 28, 2025 | Tags:
Carbon monoxide poisoning is responsible for 100,000 emergency room visits annually, putting people at risk for sudden illness and even death. While it can’t be seen or smelled, carbon monoxide poisoning can be prevented. Knowing the facts and taking precautions can help protect you and your loved ones.
What is carbon monoxide?
Carbon monoxide (CO) is a colorless, odorless and tasteless gas that’s produced when gasoline and other fuels burn. When inhaled, it quickly reduces the blood’s ability to carry oxygen throughout your body, blocking it from vital organs and putting you at greater risk for health issues.
Called “the invisible killer” or “the silent killer,” CO is extremely poisonous and being exposed to high levels or over a long period of time is deadly.
Why do carbon monoxide poisonings rise in winter?
As temperatures drop during winter, people turn up their heat sources, like furnaces, generators, gas heaters or stoves. These are common sources for CO used during winter weather or power outages that can increase a person's risk of CO poisoning. Heating sources need proper ventilation as CO can build up in enclosed or semi-enclosed spaces, like garages and various areas in the home. Running any gasoline-powered engine, like a generator, in an enclosed space is hazardous, even with doors and windows open. Use extreme caution when using these devices.
Carbon monoxide poisoning symptoms
CO poisoning affects all parts of the body, especially the heart, brain and nervous system. Exposure over time can mimic the flu without the fever or can give the appearance of being drunk. Low levels of CO poisoning include:
- Mild headache
- Nausea
- Dizziness and weakness
- Mental confusion or disorientation.
When exposed to higher levels of CO, symptoms can include:
- Severe headache
- Sleepiness or fatigue
- Shortness of breath
- Vomiting or upset stomach
- Chest pain
- Blurred or impaired vision
- Loss of consciousness or muscle coordination
How to prevent carbon monoxide poisoning
CO poisoning is largely preventable. The following tips can help:
- Install a CO detector: Place battery-operated alarms inside your home at a central location outside each sleeping area and on each floor level. Test alarms at least once per month and check batteries twice per year. Replace CO detectors every five to 10 years, depending on the manufacturer date and owner’s guide for replacement recommendations.
- Use fuel-burning appliances properly: Hire a trained professional to inspect appliances each heating season. Follow instructions for use and make sure gas appliances are vented properly. Only use portable generators outdoors in well-ventilated areas that are more than 20 feet away from doors, windows and vents.
- Keep fireplaces well-maintained: Have fireplaces and chimneys inspected and cleaned every year. Check flues and vents for blockages from debris.
If you suspect carbon monoxide poisoning
If you or other members of your household suspect a CO leak, are experiencing CO poisoning symptoms or your CO detector goes off, go outside immediately and call 911 or your local emergency services:
- Do not stay indoors to call for help.
- Do not try and find the source of the gas.
- Do not reenter your home until you’re told it’s safe by emergency responders.
Account for everyone in your house to ensure their safety. If you’re unable to get outdoors safely, open a window or door and stay by it while calling emergency services. If you have questions or concerns about CO poisoning, call Poison Control at 1-800-222-1222 or use the webPOISONCONTROL® online tool for guidance and personalized advice.