How to tell if carbon monoxide is in the air?

Author: Florence Bogisich IV  |  Last update: Monday, November 24, 2025

The best way to alert you and your family to unsafe levels of CO is to install a carbon monoxide detector. It works like a smoke alarm, sampling the air in your home and creating a loud alarm when levels of the gas are detected. It's important to evacuate your home immediately when your CO alarm sounds.

How can you tell if there's carbon monoxide without a detector?

What Are Signs of Carbon Monoxide in Your Home?
  1. Yellow or orange flames coming out of your gas appliances instead of the usual blue flame.
  2. Dark and sooty staining on or around gas appliances.
  3. Pilot lights that frequently blow out.
  4. Increased condensation on windows.
  5. Solid fuel fires burn much slower than usual.

How to test if there is carbon monoxide in the air?

A carbon monoxide test is performed using a portable, electric detector to determine the presence of carbon monoxide in your home and how much of the toxic gas it contains in parts per million (ppm).

How can you tell if there is carbon monoxide in your house?

Signs of a carbon monoxide leak in your house or home

Sooty or brownish-yellow stains around the leaking appliance. Stale, stuffy, or smelly air, like the smell of something burning or overheating. Soot, smoke, fumes, or back-draft in the house from a chimney, fireplace, or other fuel burning equipment.

Does opening windows clear carbon monoxide?

Does Opening Windows Help With Carbon Monoxide? Opening windows helps the carbon monoxide quickly leave your home (as does opening doors). However, don't leave your exit path when getting out during this emergency to open as many windows as you can.

Carbon Monoxide Poisoning: Everything You Need to Know

Does fresh air get rid of carbon monoxide?

Its half-life is approximately four hours in the fresh air. The treatment for severe carbon monoxide inhalation is using oxygen or hyperbaric chambers to minimize the CO in your system, which you will need to do at a hospital.

What in a house would give off carbon monoxide?

Carbon Monoxide sources in the home

Water heaters. Furnaces or boilers. Fireplaces, both gas and wood burning. Gas stoves and ovens.

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.

Can I test myself for carbon monoxide?

Diagnosing Carbon Monoxide Poisoning. There isn't a self-diagnosis option for carbon monoxide poisoning. Symptoms may include: Headache and nausea.

What's the most common household thing to cause a carbon monoxide leak?

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.

Can I check carbon monoxide levels with my phone?

Co Checker is a free Android app developed by Meter App, falling under the category of Utilities & Tools. It is a simple and handy tool that helps detect the presence of carbon monoxide in the air.

Does the fire department charge to check for carbon monoxide?

In most areas, the fire department does not charge to respond to carbon monoxide alarms or to check for the presence of CO in a residence. However, policies can vary depending on the jurisdiction or specific fire department. It's always a good idea to contact your local fire department for specifics on their policies.

Would you know if you were breathing in carbon monoxide?

Key points about carbon monoxide poisoning

A common source is unvented space heaters. Symptoms of CO poisoning include headache, dizziness, weakness, nausea and vomiting, rapid heartbeat, shortness of breath, seizures, chest pain, disorientation, and loss of consciousness.

What is the easiest way to detect carbon monoxide?

A portable CO detector can be useful for detecting carbon monoxide levels near all gas-powered appliances. It's a handy way to check every room of the house. These units can be hardwired with battery backup, or you can choose a battery powered model.

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 long does it take for carbon monoxide to build up in a house?

Small carbon monoxide leaks can fill every room in your house with poisonous gas within eight hours. Severe leaks can cause this problem in just five minutes. The EPA states that exposure to concentrations of nine ppm or more for eight hours is enough to produce harmful health effects for at-risk individuals.

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 do I tell if there's carbon monoxide in my house?

7 Signs of a Carbon Monoxide Leak in Your Home
  1. Your Family Has Symptoms of the Flu. ...
  2. Symptoms Are Situational. ...
  3. Your Pets Get Sick. ...
  4. Soot Accumulates in or Around Your Exhaust Vents. ...
  5. Yellow or Orange Pilot Light. ...
  6. You See Heavy Condensation. ...
  7. Your Nose Detects Exhaust Gases.

Can I go to sleep after carbon monoxide exposure?

Carbon monoxide is dangerous because a person may not recognize drowsiness as a symptom of poisoning. Consequently, someone with mild poisoning can go to sleep and continue to breathe the carbon monoxide until severe poisoning or death occurs.

Can you detect carbon monoxide without a detector?

You cannot detect carbon monoxide on your own which is why it is called the silent killer.

Is there an app that can detect carbon monoxide in your house?

Nest Protect will sound an alarm and send a message to the app when it detects that carbon monoxide (CO) levels have reached an emergency level. It is important that you always respond to a CO emergency by evacuating the house and calling emergency services.

What will my alarm do if it detects carbon monoxide?

When the carbon monoxide alarm senses a dangerous level of CO gas, the unit will emit a loud alarm pattern. The alarm pattern is four short beeps – followed by five seconds of silence – followed by four short beeps.

How to tell if your house is toxic?

If you suspect your asthma worsens or is more severe than usual, contact your doctor or medical professional.
  1. Bad Smells In The Home. When there's a bad smell in the home, you can tell. ...
  2. Peeling Wallpaper. ...
  3. Spots On The Wall. ...
  4. Bad Allergies Won't Go Away. ...
  5. Visible Mold Growth. ...
  6. Past Water Damage.

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.

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.

Previous article
What is the best slope for water runoff?
Next article
Do you need an air vent in the kitchen?