What raises carbon monoxide levels in a home?

Author: Keeley Glover  |  Last update: Saturday, June 20, 2026

How can carbon monoxide build up in a home? The most common causes of carbon monoxide building up are incorrectly installed or poorly maintained or ventilated appliances – like stoves and hot water heaters. Poorly ventilated fireplaces and other gas- or wood-burning appliances can also pose danger.

What causes high carbon monoxide levels in a house?

Carbon Monoxide sources in the home

CO is produced whenever a material burns. Homes with fuel-burning appliances or attached garages are more likely to have CO problems Common sources of CO in our homes include fuel-burning appliances and devices such as: Clothes dryers.

What puts off carbon monoxide in a house?

The most common cause of carbon monoxide (CO) in a home is malfunctioning or poorly ventilated fuel-burning appliances, such as gas stoves, water heaters, and fireplaces. When these appliances do not burn fuel completely or lack proper ventilation, CO can build up indoors.

What is the most likely source of carbon monoxide in a house?

One of the most common sources of exposure in the home is the gas or kerosene-powered heater. Gas-powered water heaters, stoves, and furnaces may also produce carbon monoxide.

What releases a lot of carbon monoxide?

The greatest sources of CO to outdoor air are cars, trucks and other vehicles or machinery that burn fossil fuels. A variety of items in your home such as unvented kerosene and gas space heaters, leaking chimneys and furnaces, and gas stoves also release CO and can affect air quality indoors.

Carbon Monoxide Poisoning: Everything You Need to Know

What household items can give off carbon monoxide?

How can carbon monoxide build up in a home? The most common causes of carbon monoxide building up are incorrectly installed or poorly maintained or ventilated appliances – like stoves and hot water heaters. Poorly ventilated fireplaces and other gas- or wood-burning appliances can also pose danger.

What is the single largest source of carbon monoxide?

It comes from the incomplete combustion of fuels with carbon, such as oil, coal, wood, gasoline and natural gas. Vehicle emissions account for the largest source. Breathing air with high concentrations of CO can result in multiple health effects. Since 1971, EPA has maintained two standards for carbon monoxide.

Will opening a window help with carbon monoxide?

If you experience symptoms that you think could be from CO poisoning: DO GET FRESH AIR IMMEDIATELY. Open doors and windows, turn off combustion appliances and leave the house.

How to detect carbon monoxide without a detector?

Signs of carbon monoxide:
  1. Stuffy or stale air.
  2. A pilot light keeps going out.
  3. More condensation than usual on your windows.
  4. Soot build up around a fireplace, chimney, or other fuel-burning equipment.
  5. Fuel-burning equipment has a back-draft (flame flares up when a window or door opens and adds air).

Do electric appliances emit carbon monoxide?

Appliances that run on electricity do not produce carbon monoxide.

How do I lower the carbon monoxide levels in my house?

Steps to Reduce Exposure to Carbon Monoxide

Additional ventilation can be used as a temporary measure when high levels of CO are expected for short periods of time. Keep gas appliances properly adjusted. Consider purchasing a vented space heater when replacing an unvented one. Use proper fuel in kerosene space heaters.

Do electric dryers produce carbon monoxide?

Do electric dryers release carbon monoxide? No, you cannot get carbon monoxide poisoning from an electric dryer because there's no gas involved. Carbon monoxide and its potential for poisoning cannot be produced by any appliance that do not burn gas.

What are two warning signs of carbon monoxide poisoning?

The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as “flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you.

What releases carbon monoxide in a home?

It is produced by burning any fuel. Your home may contain one or more appliances that produce CO. These include: oil or gas furnaces, gas water heaters, gas or propane barbeques, gas space heaters, gas ranges and ovens, fireplaces, and wood-burning stoves. Vehicles also produce carbon monoxide.

What can cause carbon monoxide to increase?

Elevated levels in cities are caused by the concentration of traffic, industry and heating needs. Indoors, elevated CO levels can be traced to gas appliances, tobacco smoke, or poorly vented or unvented combustion sources.

Do electric water heaters produce carbon monoxide?

Where does CO come from? Carbon monoxide is produced by devices that burn fuels. Therefore, any fuel-burning appliance in your home is a potential CO source. Electrical heaters and electric water heaters, toasters, etc., do not produce CO under any circumstances.

How do I use my iPhone to detect carbon monoxide?

Go to the Home app on your iPhone or iPad. , then tap Home Settings. Tap Safety & Security. Tap Sound Recognition, then turn on Smoke & CO Alarm.

Should I call 911 if my carbon monoxide alarm goes off?

My carbon monoxide alarm is sounding. What should I do? Call 911 and report what is happening. Immediately leave your residence and wait for the fire department to arrive.

How do you know if carbon monoxide is leaking in your house?

Any of the following could be a sign of a carbon monoxide leak: Floppy yellow or orange flame on your gas hob or oven, rather than a crisp blue flame. Dark, sooty staining on or around gas appliances. Pilot lights that frequently blow out.

How to clear a house of carbon monoxide?

If no one is feeling symptoms, ventilate the home with fresh air and turn off all potential sources of CO. That includes your oil or gas furnace, gas water heater, gas range and oven, gas dryer, gas or kerosene space heater, and any vehicle or small engine.

What is the most common source of carbon monoxide?

One of the most common sources of carbon monoxide in the home is a faulty furnace. A malfunctioning furnace can leak CO into your indoor air, causing it to build up and create an unsafe living environment.

Can dogs smell carbon monoxide?

Carbon monoxide, commonly known as CO, is an odorless, colorless, and non-irritating gas. No pet can identify the gas because CO lacks any scent whatsoever. Exposure can lead to carbon monoxide poisoning in both humans and pets.

How to lower carbon monoxide levels?

Start with these seven tips to help keep your home and family safe from carbon monoxide.
  1. Know the risks of CO poisoning. ...
  2. Keep your vents clear. ...
  3. Don't run engines in a closed area. ...
  4. Schedule regular maintenance. ...
  5. Keep fireplaces clean and well vented. ...
  6. Install CO alarms. ...
  7. Maintain your CO alarms.

What is the acceptable level of CO indoors?

The World Health Organization recommends that the indoor air level for CO be below an average of nine parts per million (ppm) for any eight-hour period, and below 25 ppm for any one-hour period.

What is the most harmful air pollutant to human health?

Fine particulate matter (PM2.5) is the air pollutant driving the most significant health problems and premature mortality. In 2021, 97% of the urban population was exposed to concentrations of fine particulate matter above the health-based guideline level set by the World Health Organization.

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