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What is Off Gassing and Why It’s Bad

If you have heard the term off gassing, you’re probably wondering what does it mean? Sure, you might have a vague idea that it has something to do with a new car smell and something to do with VOCs (though, you might not know what a VOC actually is.)

Off gassing is a real health threat and it’s something that you have some control over in your home, so now is the time to really understand what is off gassing and how to prevent it.

woman relaxing on white couch in white room with lots of windows and minimalistic decor

What is Off Gassing?

Okay, the first time you heard the term “off gassing,” maybe it conjured up images of third-grade flatulence jokes. Seriously, we’ve probably all thought that at one time or another, so it’s okay!

Also, off gassing can be spelled many ways. It all means the same thing, whether it’s spelled:

  • Off gassing
  • Off-gassing
  • Offgassing

No one seems to be tied to a definite way of spelling it.

So, now that we’ve got the fart jokes out of the way and the confusion about spelling, here’s what off gassing really is:

Off gassing is when volatile organic compounds (VOCs) are released into the air that you breathe.

VOCs might sound nice because they have the word organic in them. But they are not.

VOCs are incredibly small pieces of chemicals that come unattached from a material or product over time. When the VOCs unattach themselves, they become gases in the air. Off gassing VOCs happen in a wide array of products, including solid materials and liquid materials.

upholstered arm chairs in living room

What are Off Gassing VOCs?

Volatile organic compounds can be all kinds of chemicals. There are thousands of chemicals allowed to be used in materials intended for use in your home, workplace or vehicle every day. In fact, around 80,000 new chemicals have been invented since World War II.

And many of them will off gas.

Among the biggest offenders, and the most widely discussed VOCs, are:

  • Formaldehyde
  • Polyurethane foam
  • Phthalates
  • Chloroform
  • Phthalates
  • Acetone
  • Ozone
  • Ethanol
  • Chemical flame retardants
  • Methylene chloride
  • Benzene
  • Perchloroethylene (found in dry cleaning solutions)

Why does the term VOC include the word “organic?” Especially if VOCs are thought to possibly be bad for health? Organic doesn’t always mean chemical-free, like we associate with organic foods or organic skincare products. In this case, a VOC contains the word “organic” because the chemicals contain a compound of carbon and will easily become a vapor or a gas.

Research on VOC Hazards

Some off gassing VOCs are thought to be carcinogenic, which means they cause cancer.

Other VOCs are considered harmful when they mix with other chemicals as gasses.

Have you ever heard of smog? It’s something that we’re probably all familiar with. Smog is actually the result of VOCs combining with pollution in the outside air to produce smog, which affects air quality and concerns many about potential health risks.

This resource from the Centers for Disease Control (CDC) goes into much more detail the potential problems of chemicals.

Or visit this searchable database that lists 180 human diseases linked to chemical contaminants.

Where Do VOCs Come From?

VOCs can off gas into your home, office or vehicle from many different materials. Some of the most common sources of VOCs are:

  • Paints and painting supplies, including acrylics (Check out my shopping list for Zero VOC Paints)
  • Furniture
  • Carpets, including area rugs (Here’s my Ultimate List of Low VOC Area Rugs)
  • Flooring (See my Guide to Allergy Friendly Flooring)
  • Vinyl windows
  • Cleaning supplies
  • Craft or hobby supplies, including wood stains, glues, adhesives, paint strippers, varnishes
  • Aerosol spray
  • Cosmetics
  • Building materials
  • Gasoline
  • Pesticides
  • Moth repellents
  • Copiers and printers
  • Burning wood, coal or natural gas
  • Smoking

Not all of these items will always off gas potentially harmful VOCs. For instance, if you used a non-toxic milk paint rather than a latex paint, you wouldn’t have to worry about VOCs as much.

paint brush and pink paint on white wall

If you brought in a natural sisal area rug into your home, rather than a wall-to-wall carpet of synthetic fibers, you dramatically reduce the potential of VOCs.

VOCs off gas depending on what a product is made from.

How Long Does it Take to Off Gas?

There is no one time frame that it takes for products such as carpeting, rugs or mattresses to off gas.

Generally, the largest amount of off gassing takes place in the first few months. For instance, the moment that you unwrap a new mattress, that’s when it will likely off gas the most.

Or when a new rug is unwrapped from plastic. That’s when the highest amounts of VOCs are released. (Which is why it’s smart to unwrap it and let it sit outside for a few days to a few months before installing it where you live.)

throw rug on wooden floor with grey fuzzy slippers

While the first few weeks or months generally have the highest levels of off gassing, it doesn’t mean that the off gassing stops afterwards.

In fact, off gassing can last for years. Carpet off gassing can definitely last five years or more.

Off gassing can potentially go on for the life span of the product. There is no easy way to tell.

Home on a green grass covered hill against a bright blue sky with clouds

How Can I Tell if Something is Off Gassing?

You can’t see chemicals coming out of a material or product in your home.

And trying to determine if an item is off gassing based on scientific testing is sketchy, at best, in a normal home setting.

There are many companies that will help you test the indoor air quality of your home. (Here’s my experience testing for off gassing formaldehyde in the RV where I was living.)

Atmotube is a portable air quality monitor that does a great job of alerting you to poor air, including what the VOC levels are.

Atmotube air quality monitor in hand

But to pinpoint one product off gassing certain chemicals? Now, that is not something that’s entirely feasible from a homeowner’s standpoint, both because of the lack of practical tests and the potential costs involved.

Off Gassing Smell

So it’s usually based on a person experiencing health problems, or smelling an unusual smell.

An odor is not always a sign of an item off gassing. But it is often a sign. You know how a new car has that “new car smell?” Yep, that’s off gassing chemicals.

Just like you can smell a new car, you might be able to smell an odor when a new item is brought into your home.

Especially if it’s plastic. Or flooring or carpeting. Even new furniture and new mattresses have distinctive odors that can be an indicator of off gassing chemicals.

brown chairs on white rug with white end table in sunny room

There is not one specific type of odor that you might recognize from off gassing chemicals. Odors range from sweet or metallic, to earthy or chemical-like. Every VOC is different, and everybody’s reaction is different.

When you unroll a new bed-in-a-box in your home, you might notice a distinctive smell. (And your husband may not.) That can be off gassing. But it probably will smell different compared to a new wall-to-wall rug that was just installed, which could also be off gassing.

Or you might not smell anything at all.

For instance, phthalates often can not be smelled at all.

Which makes things so complicated. And it is often not until you start feeling unwell or get sick that you might even start thinking that you’ve been exposed to off gassing VOCs.

Off Gassing Symptoms

Why would you have health problems from VOCs? Blame it on your indoor air quality.

Indoor air quality (IAQ) is a scientific determination of how healthy or polluted your indoor air is. The problem with modern society is that our indoor air quality keeps getting worse.


As homes become more energy efficient by reducing the amount of air that escapes from inside the home, that means that less fresh air can get inside the home to flush out the nasty chemicals. Which means our indoor air quality keeps getting worse as VOC levels accumulate.

Which might just be a reason why more and more people have allergies or asthma. It is estimated that at least one out of every 12 Americans has asthma. And many more people have indoor allergies.

Who is at Risk?

While no one should be breathing in toxic chemicals, there are some people who are more at risk.

Babies and children are especially at risk, because their physiological systems are still developing. And they spend a lot of time on the floor, where there is a tendency for more off gassing from flooring and carpets.

Adults who have respiratory problems, or weakened immune systems, are also more vulnerable.

Family pets are not immune to the problems of off gassing, either. Since pets, including dogs and cats, are often on the floor a lot, they can be exposed at higher concentrations, too.

Health Dangers

Asthma and allergy flare ups are just one of the symptoms of being exposed to off gassing. Other short term health symptoms are:

  • Headaches
  • Dizziness
  • Fatigue
  • Nausea
  • Eye, nose and throat irritation
  • Problems with vision
  • Memory problems

Long term health symptoms from VOCs and poor indoor air quality are not conclusive. Potential health risks are thought to be:

  • Cancer
  • Respiratory problems
  • Heart disease
  • Kidney damage
  • Liver damage
  • Central nervous system damage

In fact, off gassing is such a health threat that NASA had to find a way to take care of the off gassing problem before sending astronauts to live and work in space. Scientists had to determine how to reduce VOC exposure levels in a space station that would never get fresh air. That’s where the famous scientific studies came from that plants can actually help clean your indoor air.

All of the findings were compiled in a book that I think everyone should own: How to Grow Fresh Air.

How to Prevent Off Gassing

There aren’t a ton of ways to totally prevent off gassing. While it would be nice, it’s just not the case. (Although there is a product that states it can help prevent off gassing from paint and building materials. I tried it out.)

Instead, the smart answer is to stop bringing products indoor that will off gas. Or to remedy off gassing from bringing in more fresh air. Here are some examples of how to prevent problems from off gassing:

Avoiding Off Gassing Products

  • Choose cleaning supplies made with natural ingredients rather than synthetic chemicals. Vinegar is one of the best natural cleaners, and I have a tutorial on what vinegar is best for cleaning. While you can buy non-toxic and natural cleaning supplies at the store, they are surprisingly easy to make at home, too. Check out these recipes for a no streak homemade glass cleaner spray, all natural kitchen cleaner, natural odor eliminator, and how to use vinegar to clean a toilet.
  • Choose unscented products, from cleaning supplies to cosmetics and candles. Toxic VOCs can be found in artificial fragrances.
  • Only choose Low-VOC or No-VOC paints. There are plenty of options for paints that have way less chemicals off gassing. But do keep in mind that paint can be called Low-VOC or No-VOC because the base of the paint doesn’t off gas, but the tint added to it might be a major offender for off gassing. So be sure you know what you’re buying.
  • Avoid chemical flame retardants. Sometimes you can ask for products to be made without the toxic chemicals. Other times, you can use natural materials as flame retardants, instead. For instance, wool used in mattresses rather than chemical-based flame retardants.
  • Don’t smoke. Case closed. And avoid smoking areas if you are a non-smoker. Which means don’t let people smoke in your home or at the entrance to the buildings where you work. Secondhand smoke is just as toxic for non-smokers as it is for those who are doing the smoking.
  • Avoid heating from wood burning fireplaces, natural gas or coal-burning stoves, etc. Consider electric heat, especially radiant floor heating.

New Rug Off Gassing

area rug with tassels on wooden floor

  • Check out our essential guide to allergy friendly flooring, which includes lots of options for floors that contain low- or no-VOCs.
  • Carpet off gassing occurs because of the toxic adhesives and padding sometimes used. To reduce carpet off gassing, it’s important to choose products that don’t contain toxic chemicals. (You will also want to be careful to work with contractors and installers who are willing to install what YOU want, not what they can get for the least expensive cost.)
  • Area rug off gassing is a problem, too, if there is a backing on it made with materials and adhesives that contain chemicals. But it generally is not as big of a problem as installed wall-to-wall carpeting. However, there are definitely exceptions to this rule. I had a client that had an area rug that was registering VOC levels way higher than her wall-to-wall installed rug.
  • An area rug made with natural materials (such as jute) and has no backing generally will off gas very little. You can purchase a separate rug gripper made with non-toxic materials to prevent slipping.

Woman sitting on mattress in bedroom

How to Avoid Furniture Off Gassing

  • Choose furniture made from natural materials. Adhesives used in MDF, particleboard and other materials can be a source of off gassing. So choosing real wood furniture, or furniture from metal, which doesn’t off gas.
  • Even solid wood furniture made with toxic glues and adhesives isn’t good. So check to make sure no-VOC paints, sealants and stains are used. As well as water-based glues.
  • Or buy vintage or thrifted pieces of furniture which would have the majority of off gassing done long ago.
  • Mattresses made from all organic cotton, chemical-free wool and natural latex (not synthetic latex) are generally safer from VOCs. Here’s my favorite non-toxic mattresses. Mattresses made from synthetic materials, such as polyurethane and synthetic latex, will off gas more.
  • When I couldn’t afford a natural mattress years ago, I bought a floor model of a conventional mattress. It wasn’t a perfect solution, but at least the new mattress had off gassed in the store for a while. (And I got it cheaper.)

tan upholstered chair with blue throw pillows on white carpet

Getting Rid of VOCs from Off Gassing

  • Use air filters to scrub your indoor air and remove VOCs. Not all air filters are created equally. You want the best air filter that will remove the smallest particles possible. So you’ll probably need to pay a little more, but it will be worth it.
  • Open your windows and doors. Don’t do this during prime allergy season, or when there is smog. But if the air quality outside is good, get some fresh air inside to push out the nasty VOCs.
  • Use products that contain high levels of VOCs (think paints, paint strippers, varnishes, stains, etc.) outdoors or in well ventilated areas. Be sure you can open windows when painting or using wood stain.
  • Buy just-enough of the high-VOC products that you use. For instance, if you use a paint stripper for a DIY project, don’t buy the entire gallon of it just because it’s a couple dollars more. Storing these products, even if they are in a garage, can release VOCs into the air that you don’t want.
  • Put items that you know will off gas outside. Getting new flooring or new carpeting? Or new kitchen cabinets made from MDF? Store it unwrapped outside for as long as you can. Maybe on a covered porch, or in a garage with the door open. Ask an interior designer or installer to put the item in a warehouse for a while before installation to start off gassing. Your goal is to get as many of the chemicals out of the product as you can before brining it into your home where it will get into your indoor air.
  • High temperatures and increased humidity are thought to off gas items more quickly. Many people think that putting a mattress, carpet, furniture or other items in direct sunlight will bake out the VOCs even faster. Keep in mind, you’ll need to do this for a bare minimum of a few hours, with optimal results from days or weeks of off gassing in the sunlight or at high temperatures.
  • If you don’t want to increase the off gassing rate, then be sure to keep your humidity levels low in your home. Generally a humidity level of 40-50% is preferable. Use a dehumidifier to keep humidity within that range.

  • Get as many plants as you can inside. Choose houseplants that are known to help clean the air. The more you have throughout your home, the less VOCs will be in your indoor air.

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Friday 3rd of July 2020


Thank you for all of the research and energy you have put into your writings. Your writings, (I'm sure I have not read them all) are well done in their clarity and completeness!

I noticed floors were in red on your list.

I have been researching to replace floors with glue down cork tiles but then on I ran across something called corkoleum. My understanding is that The original linoleum was pretty clean. Now a days sales reps use the words vinyl and linoleum interchanably (frustrating). We know vinyl is bad but how about this new corkoleum stuff? Has it been around long enough? If I remember correctly The layers are cork, pu, and rubber.

I actually found you on YouTube - supervising your husband's painting of your Rv!

I applaud all your efforts - again I've not seen or read everything but I'm working on it! I Will be clicking your Amazon links.

Thank you again for all your nicely packaged information!

Kimberly Button

Monday 6th of July 2020

Hi Rosalie! Thanks for the kind words! And for watching me supervise my husband's painting ;) Personally, I wouldn't put that flooring in my own home because it has recycled rubber (synthetic rubber likely, not all natural) and it has a polyurethane component. Neither of those things are what I'd want in my own home. Cork is a great option, just not with added synthetic materials to it.