How to Recognize and Prevent Carbon Monoxide Poisoning

Carbon monoxide poisoning often occurs in the winter—the same time that cold and flu season thrives. This is because as we burn fuels to heat our homes in the winter, these fuels omit carbon monoxide. Cars, generators, stoves, furnaces, fireplaces, and other fuel burning appliances can cause carbon monoxide poisoning.

If we do not properly install and regularly maintain the fuel burning appliances in our home, the carbon monoxide builds up in the enclosed or semi-enclosed spaces in our tightly sealed homes or automobiles. Breathing in these fuels can lead to carbon monoxide poisoning, hospitalization, or in a worst case scenario even death.

As you winterize your home and car this season, don’t forget to protect yourself against carbon monoxide poisoning.

Have you ever wondered what exactly is going on inside your body when you experience Carbon Monoxide Poisoning?

According to the New York Times Health Guide, if you breathe in carbon monoxide the poison replaces the oxygen in your bloodstream. Your blood helps oxygen to flow to all of the vital organs in your body. But if carbon monoxide gets into your blood stream, “your heart, brain, and body will become starved of oxygen.” This lack of oxygen may result in death if not recognized or treated in time.

The tricky thing about carbon monoxide is that it’s a colorless and odorless gas. However, there are several signs and indicators that you can learn to recognize if there is a buildup of carbon monoxide in your home.


One of the main physical signs of Carbon Monoxide Poisoning is experiencing symptoms ONLY in the location where a high concentration of carbon monoxide is present. For instance, if you only experience involuntary muscle twitching at school, but not at work, home, or the grocery store, there may be carbon monoxide poisoning in your school.

However, not everyone will experience the same symptoms of Carbon Monoxide Poisoning. Aside from flu-like symptoms, there are several other physical symptoms to be aware of. You may only experience some of these symptoms.

Shortness of Breath


Blurred, spotted, gray or black and white vision

Loss of Consciousness

Reduced Muscle Coordination and Balance (trouble walking)

Involuntary muscle twitching, tremors (Parkinson-like symptoms)

Problems writing (thinking clearly)

Difficulty hearing

Muscle or joint pain

Difficulty processing visual information like fast moving images

Increased urge to urinate


Problems regulating Body temperature

If you think you have been exposed to carbon monoxide, get medical attention immediately. Stepping out into fresh air will lessen the symptoms, but will not remove the poisoning and oxygen deprivation occurring in your bloodstream entirely.


If you experience any of the physical symptoms above, but seem to improve in areas with clean oxygen, start looking for visible signs of poor ventilation around your home that could lead to carbon monoxide poisoning. It might even be a good idea to keep an eye out for these signs before winter arrives. These visible signs include:

Moisture inside windows or walls in furnace room (or inside your car)

Clogged Chimney

Excessive rusting or water streaking on Chimneys, flue pipes, or appliance jackets

Debris or soot falling from appliances, chimneys, furnaces, or fireplaces

Small amounts of water leaking at the base of the chimney, vent, or flue pipe

Streaks of carbon or soot around the service door of your fuel burning appliances

Loose or disconnected appliances (vents, chimneys, fireplaces)


Only trained service technicians can identify the “invisible” signs of carbon monoxide poisoning and correct them. This is why it’s important to have a service technician look at your appliances yearly to make sure they’re safe.  Here are some invisible signs of carbon monoxide poisoning:

Internal appliance damage or malfunctioning

Hidden blockage or damaged chimneys

Improper Burner adjustments (on stoves and furnaces)


Buy and Maintain Carbon Monoxide Detectors

Place one outside of each sleeping area in your home (in the immediate vicinity of bedrooms)

Regularly test your detectors (once a month) to make sure they work

Replace batteries in detectors each fall

IMPORTANT: Always install your detector following the manufacturer’s instructions so that it will work properly.

Learn to Operate Appliances Safely

NEVER run a generator in your home or garage. Keep the generator outside, and away from windows, doors, and vents while its running. Opening windows and doors for ventilation will not prevent carbon monoxide build up.

NEVER install fuel burning appliances in your home without proper knowledge, skills, or tools.

NEVER operate an unvented gas burning appliance in a room where you are sleeping.

General Prevention Tips

NEVER leave a car running in a garage even with the garage door open.

NEVER burn charcoal in homes, tents, vehicles, or garages.

NEVER put foil on bottom of a gas oven; it interferes with combustion.

You don’t want to solely rely on the detector to identify carbon monoxide. Prepare, update, and maintain your home and appliances BEFORE there is a problem.


DO NOT burn anything larger than candles in your home without proper ventilation

Vent all heaters that run on a fuel source such as natural gas, kerosene, butane, or oil (this does not apply to electric heaters)

DO NOT use your oven or your stove to heat your home. Doing so can create fires and allow toxic fumes to enter your home

Purchase an Indoor Safe Heater with an oxygen depletion sensor and an accidental tip-off shut off feature (this will protect against CO buildup and fires). Check out our Mr. Heater line of indoor safe heaters that follow these regulations. 

Now that you know some ways to protect yourself and your family from carbon monoxide poisoning, remember these preventative measures as you winterize your home.  And while you’re at it . . .  check out our blog post, “How to Winterize your Home” to pick up more winter safety tips.

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