Are Air Fresheners Bad for You? Toxic Ingredients & Natural Swaps

QUICK SUMMARY

Are air fresheners bad for you? Yes, most conventional air fresheners make your indoor air worse, not better. Plug-ins, sprays, gels, wax melts, and car fresheners release volatile organic compounds (VOCs); in a 2022 study of 15 air fresheners, heavy use could push short-term formaldehyde and acrolein levels past health reference values, and in 2025 the fragrance in “flame-free” wax melts formed about as many airborne nanoparticles as a gas stove. (1, 2)

The healthier path is simple: remove the source of the odor, let in fresh air, and use a homemade essential oil room spray or short diffuser sessions in a ventilated room instead.

One of the first things you do when you step into your home after a busy day of errands is take a deep breath. Heave a big sigh of relief and relaxation. But what if that “ocean breeze,” “linen fresh,” “spring meadow,” or “clean cotton” scent you are inhaling is working against you?

Air fresheners are not designed to purify your air. They are designed to change what you smell. Most of them do not remove the source of the odor; they mask it or overpower your nose with synthetic fragrance.

That is why our own swap is Mama Z’s Heavenly Scent Room Spray, a few drops of magnolia and citrus essential oils in grain alcohol and distilled water. This article is the why behind that recipe: what the research says air fresheners put into your home, and what to use instead.

More and more unscented, fragrance-free, and free-and-clear products are commercially available as the public becomes increasingly aware of skin irritations, headaches, breathing problems, and allergy symptoms associated with highly scented personal care and cleaning products. However, the problem goes deeper than the minor inconveniences on most consumers’ minds.

Indoor air is one of the most overlooked health issues in the modern home. We obsess over food labels, supplements, workout plans, and water filters, but then we plug synthetic fragrance into the wall and breathe it all night long. The breath of life is a gift from God, and the air in our homes should support life, not add to our toxic burden.

EPA reports that Americans spend about 90 percent of their time indoors, where levels of some pollutants are often 2 to 5 times higher than outdoors. Concentrations of many VOCs are consistently higher indoors, up to ten times higher, and EPA names air fresheners and aerosol sprays among the household sources. (3, 4)

What Air Fresheners Release Into Your Home

In 2022, French researchers tested 15 air fresheners that do not burn (4 sprays, 6 passive diffusers, and 5 electric diffusers) in a full-size experimental house, then modeled how real families use them. At average use, long-term exposure did not reach a level of concern. Under heavy but realistic use, though, one hour of exposure could push formaldehyde to about 370 micrograms per cubic meter and acrolein to 23, both beyond health reference values, and sprays drove fine particles above 100 micrograms per cubic meter. (1)

Over the long term, acrolein, benzene, and limonene were the compounds most likely to exceed health standards in those heavy-use homes. The researchers’ conclusion was plain: “the emissions of the highest-emissivity products should be lowered.” (1)

A 2023 chamber study of 30 cleaning products and air fresheners sold in the United States counted 530 different VOCs, and 193 of them are listed as hazardous by California or European chemical agencies. Conventional products released the most, “green” products with fragrance released less, and fragrance-free green products released the least. (5)

Air fresheners also keep reacting after they leave the bottle. Fragrance terpenes such as limonene react with ozone in indoor air, and a 2024 study that tracked that reaction in real time recorded formaldehyde among its main products, along with brand-new secondary organic aerosol particles. (6)

Even flame-free products do it. In 2025, Purdue University engineers measured scented wax melts in a residential test house and found that terpenes from the warm wax reacted with indoor ozone to form more than a million nanoparticles per cubic centimeter, levels comparable to scented candles, gas stoves, and diesel engines. In their words, “Our results challenge the perception of scented wax melts as a safer alternative to combustion-based aromatherapy.” (2)

Your car is an even smaller room. When Seoul National University researchers sprayed air freshener inside vehicle cabins for less than a minute, particle counts jumped right away and total VOCs reached 364 micrograms per cubic meter in the front seat. Recirculation mode cleared particles but kept the VOCs circulating, while switching the vents to outside air cut VOC levels by more than 40 percent compared with the other settings. (7)

Put simply, the chemical coming out of the plug-in or spray is only part of the story. Once it is in your indoor air, chemistry keeps happening.

How Air Fresheners Affect Your Health

Fragrance affects people differently. Some of us never notice it; others get a headache within minutes. These are the effects the current research supports, especially for children, pregnant women, people with asthma or migraines, and anyone who is sensitive to scents.

1. Asthma and Breathing Problems

In France’s CONSTANCES cohort of 41,570 adults, weekly use of scented products (scented cleaners, home fragrances, scented candles, and electric or spray air fresheners) was tied to 15 percent higher odds of current asthma, and weekly use of sprays to 18 percent higher odds, with the risk rising as use became more frequent. Green and homemade products showed a link too, but when they were not used alongside harsh irritants and sprays, it faded. (8)

That fits what people have been reporting for years. In a landmark 2016 national survey of 1,136 American adults, 34.7 percent said fragranced products gave them health problems such as migraine headaches and breathing difficulties. (9)

Application: Start in the bedrooms. Remove air fresheners, scented laundry products, and artificial fragrances from the rooms where your family sleeps and recovers.

2. Migraines and Headaches

Smell is one of the best-documented migraine triggers. A 2025 meta-analysis pooled 58 studies of 22,299 people with migraine: 47.8 percent had osmophobia (an aversion to odors during attacks), and 40.1 percent said odors trigger their attacks, with perfume as the leading trigger. (10)

If you find yourself suffering from frequent headaches, removing artificial fragrance is one of the simplest experiments you can run.

Application: Try a 30-day artificial fragrance fast. Remove plug-ins, candles, wax melts, scented laundry, perfume, cologne, car fresheners, and scented cleaning sprays, then track headaches, mood, sleep, breathing, and energy.

3. Dizziness, Nausea, and Irritated Eyes and Throat

EPA lists eye, nose, and throat irritation, headaches, loss of coordination, nausea, and dizziness among the effects of VOC exposure, and notes that some VOCs can damage the liver, kidneys, and central nervous system. (4)

Scent can calm you, irritate you, comfort you, or overwhelm you before you even have time to think it through. If synthetic fragrance triggers symptoms in your body, listen. For calming aromas without synthetic fragrance, see our essential oils for anxiety guide. When you need to relieve nausea symptoms, clearing synthetic fragrance out of the room is a good first step.

Application: Remove synthetic fragrance from your car. Car fresheners, vent clips, hanging trees, and scented sprays create concentrated exposure in a small, closed space. If a scent makes you foggy, dizzy, nauseated, or tight-chested, do not push through it. Remove it and open a window.

4. Skin Reactions

Fragrance is one of the most common causes of allergic contact dermatitis. When the North American Contact Dermatitis Group patch tested 3,979 patients in 2023 and 2024, fragrance mix I and hydroperoxides of linalool (an oxidized fragrance compound) each caused reactions in 8.7 percent, tied for fourth among all allergens, and the fragrant resin balsam of Peru followed at 7.6 percent. (11)

Inflamed skin becomes more reactive and vulnerable. Your clothes, sheets, towels, pajamas, and pillowcases touch your skin for hours every day, and scented laundry products leave their fragrance right there.

Application: Switch to fragrance-free laundry products first, and skip dryer sheets and scent boosters.

5. Hormone-Disrupting Chemicals

In a 2024 Johns Hopkins study of 110 Baltimore children with asthma, ages 8 to 17, kids whose homes had recently used air freshener had about 1.9 times more BPA, 1.7 times more BPS, and 3 times more propyl paraben in their urine than kids whose homes had not. Recent scented candle use was linked to 2.6 times more methyl paraben. (12)

These are endocrine-disrupting chemicals, compounds that can interfere with hormone signaling, and children are in the middle of their most sensitive windows of growth. That is reason enough to take the plug-in out of the wall.

6 Air Freshener Chemicals to Know

These are the compounds that show up again and again in air freshener emission studies, either straight from the product or formed in the room afterward.

1. Formaldehyde

The National Toxicology Program lists formaldehyde as a known human carcinogen, and the International Agency for Research on Cancer classifies it as a human carcinogen. (13) It was one of the two compounds that pushed past short-term health values in the French air freshener study, and it also forms indoors when fragrance terpenes react with ozone. (1, 6)

This is the same chemical many people remember from preserved biology specimens. A “natural-smelling” synthetic fragrance can still help make it in your living room.

2. Acrolein

Acrolein is a harsh aldehyde, and in the French study it appeared on both lists of concern: over one hour of heavy use (up to 23 micrograms per cubic meter) and over the long term. (1)

3. Benzene

Benzene exposure raises the risk of leukemia and other blood disorders, and its best-known sources are tobacco smoke, gasoline fumes, and vehicle exhaust. (14) Under heavy use in the French study, air fresheners could add enough benzene to exceed long-term health standards. (1)

The point is not that every air freshener contains benzene. The point is that your home already carries a load of toxic chemicals from building materials, furnishings, and paint, and fragranced products add to it.

4. Limonene, Linalool, and Other Terpenes

Terpenes are the backbone of most fragrance. In a 2026 analysis of 91 air fresheners sold in South Korea and Europe, linalool and limonene were among the most common fragrance compounds in both regions; linalool turned up in 95 percent of the European products and limonene in 90 percent. The few compounds that raised flags in a first screening fell below their safety thresholds in realistic exposure scenarios. (15)

The trouble is what terpenes become when they meet ozone: formaldehyde and new nanoparticles. (6, 2) These are the same compounds found in citrus, lavender, and pine essential oils, which is why we cover essential oils separately below.

5. Phthalates

Phthalates help a fragrance last longer. FDA says the phthalate most often used in fragrance is diethyl phthalate (DEP) and that DEP “does not pose known risks for human health as it is currently used in cosmetics and fragrances.” (16)

We still think the wider phthalate research is reason enough to cut exposure where we can. In a 2024 Mount Sinai study of 593 mother-child pairs in Mexico City, higher prenatal levels of certain phthalates were tied to more wheeze and asthma by age 4, and a 2026 U.S. study that mailed silicone wristbands to 132 women trying to conceive found phthalate exposure in every participant. (17, 18) Because phthalates are rarely named on a label, avoiding vague “fragrance” on air fresheners, cleaners, and skincare products is one of the best practical ways to reduce exposure.

6. Synthetic Musks

Synthetic musks such as galaxolide and tonalide make a scent cling to fabric and linger in the air. In that same 2026 wristband study, galaxolide was among the compounds the researchers flagged as predicted to have medium-to-high impacts on reproductive outcomes. (18)

You should not need a chemistry degree to know what is in the products your family breathes and wears.

What the Research Does Not Show (Yet)

We want to be straight with you about where the evidence stops. No study we found ties air freshener use directly to heart attack, stroke, cancer, or depression in people, so we do not claim it here. EPA itself says that not much is known yet about the health effects of the VOC levels usually found in homes. (4)

The studies also do not all agree. In the Japan Environment and Children’s Study of 60,529 children, air freshener and deodorizer use at 18 months was not significantly linked to wheezing or asthma at age 3, while mold and wood stoves were. (19)

Here is what the research does show: air fresheners add VOCs, aldehydes, and fine particles to the air, heavy use can push some of them past health limits, and people with asthma, migraines, and sensitive skin react to fragrance. Those facts are enough for our family to choose fresh air over a plug-in.

What to Use Instead of Air Fresheners

It wasn’t until we completely detoxed our house and cleaned up the air in our home that we finally knew what health really was. In our family’s experience:

• Seasonal allergies disappeared.
• Inflammation, aches, and pains vanished.
• Brain fog cleared up.
• Unexplained symptoms like itching, allergies to airborne particles, and Candida overgrowth resolved.
• Literally, our health (and lives) transformed within weeks.

The goal is not to live in a stale, musty house. The goal is to stop perfuming problems and start creating a truly healthy home.

• Remove the Source of the Odor: Trash, mold, damp towels, dirty laundry, pet bedding, old food, garbage disposals, and bathroom moisture need to be handled at the source. Do not perfume a problem.
• Open a Window: Ventilate when outdoor air quality is good, run bathroom and kitchen exhaust fans, and maintain your HVAC filters.
• Make a Room Spray: Mama Z’s Heavenly Scent Room Spray (linked at the top of this article) gives you a fresh scent you can read every ingredient of.
• Diffuse in Short Sessions: Replace plug-ins and synthetic aerosols with our 40+ essential oil diffuser blends for sleep, focus, seasonal freshness, stress relief, and home fragrance.
• Add Scent and Healing: Use customized essential oil blends in homemade or carefully purchased natural lotions, soaps, and body care products.
• Learn Aromatherapy Basics: Essential oils are powerful plant-based tools, not synthetic perfume. Use them wisely with our aromatherapy guide and daily guide to essential oils.
• Homemade Potpourri: Add your favorite dried flowers, cinnamon sticks, citrus peels, cloves, rosemary, lavender, or herbs to a warming pot, or try sachets or decorative bowls around your home.
• Plant Fragrant Herbs: Plant herbs such as mint, rosemary, basil, thyme, and lemon balm in kitchen window herb gardens to freshen the air and provide culinary herbs for your meals.
• Use Baking Soda and Vinegar: Baking soda, plain or in an odor-eating powder with essential oils, absorbs odors in trash cans, refrigerators, carpets, closets, and shoes. White vinegar helps neutralize odors in laundry, drains, and cleaning routines, and its smell fades quickly.
• Run an Air Purifier: Use a high-quality air purifier in the rooms you use most to clear the dust, pollen, smoke, pet dander, and mold spores behind many musty odors.
• Buy Wisely: “Green” labels are not all equal, but in the 2023 chamber study, fragrance-free green products released the fewest VOCs of all. (5) Don’t be a victim of greenwashing; read the full label. See some of our favorite, trusted companies and products.

It’s so easy to get tricked by the pleasant scent we’ve been trained to look for in our laundry, cleaners, body care products, and other household items. But these fragrances are not what we need in our homes for us or our families.

“Then the LORD God formed the man of dust from the ground and breathed into his nostrils the breath of life, and the man became a living creature.” (Genesis 2:7)

Living the abundant life can be as simple as making small changes in your daily routine. Start with a switch to God-given fragrances from natural sources.

Are Essential Oils a Safer Choice?

Yes, when you use them well, and the research helps us use them well. The terpenes in citrus, lavender, and pine oils are plant compounds, and they can react with ozone the same way fragrance terpenes do. In a 2021 chamber study, Canadian researchers ran an ultrasonic diffuser with lemon, lavender, eucalyptus, and grapeseed oil for 15 minutes and measured a few milligrams of limonene, eucalyptol, and linalyl acetate in the air, along with fine particles. In the eucalyptus test, filling the diffuser with tap water instead of deionized water raised fine-particle emissions fivefold. (20)

So we diffuse the way we teach: a few drops, short sessions, a ventilated room, and distilled water in the diffuser. Keep diffusers out of a baby’s room, make sure pets can leave the room, and watch how anyone with asthma responds. For anything you spray on skin, follow our guide on how to dilute essential oils.

Keep bottles tightly capped and away from heat, because oxidized linalool is one of the skin allergens in the patch-test data above. (11)

What about myrcene? You may see beta-myrcene, a terpene found in many essential oils, on lists of harmful fragrance chemicals. In a 2010 report, the National Toxicology Program described giving rats and mice beta-myrcene in corn oil by stomach tube, 5 days a week for two years, at 0.25 to 1 gram per kilogram of body weight, and finding kidney and liver tumors. (21) For a 150-pound adult, the lowest of those doses would be about 17 grams of pure myrcene swallowed every day, while a diffuser session puts milligrams of all its terpenes combined into the room. (20) That is why myrcene is not on our list of air freshener chemicals: dose, route, and frequency make the difference.

Why the Label Won’t Tell You

The International Fragrance Association’s 2025 Transparency List names 3,312 fragrance ingredients, used for their odor or to mask malodor, plus 379 functional ingredients such as antioxidants, preservatives, and solvents. (22) This means the word “fragrance” on a label can stand for a complex blend, not one simple ingredient.

For cosmetics sold in the United States, FDA says ingredients generally must be listed individually, but fragrance and flavor ingredients can be listed simply as “Fragrance” or “Flavor.” (16) FDA also has a process for “trade secret” ingredient requests, though it says they are granted only on rare occasions under strict criteria. (23) Air fresheners are not applied to the body, so they are not cosmetics at all, and even that cosmetic labeling rule does not reach them.

So here is the practical problem: a mom can stand in a store aisle, read the label carefully, see the single word “fragrance,” and still not know what her family will be breathing, touching, washing with, wearing, or sleeping in. We are surrounded by scented household cleaners, laundry products, air fresheners, soap, body wash, deodorant, body lotion, and perfumes, all with unnamed artificial fragrance blends.

Modern homes are also built to be as airtight as possible. That saves on utility bills, but it can let fragrance chemicals build up in the very rooms where your children sleep. “Clean scent” is not the same thing as clean air.

Fragrance-free products should not contain added fragrance for scent. Unscented products have no noticeable smell, but that does not mean they are free of fragrance ingredients; a product labeled “unscented” may contain masking fragrance to hide the odor of its active ingredients, surfactants, or cleansers.

Watch out for any product with the following words on the ingredient label:

• fragrance
• perfume
• parfum
• aroma
• flavor
• unscented (usually)

Reality check: “fresh,” “clean,” “natural,” “green,” and “unscented” are not enough. Read the label. Look for true fragrance-free products. Better yet, make simple DIY swaps whenever possible so you know exactly what is going into your home.

When to Call Your Doctor

Most fragrance reactions ease once you remove the product and open a window. Call your doctor if wheezing, chest tightness, or shortness of breath does not clear with fresh air, if an asthma rescue inhaler is needed more often than usual, or if a rash blisters, spreads, or will not settle after you switch to fragrance-free products.

Get emergency care for trouble breathing that keeps getting worse. If a child swallows air freshener gel, liquid refill, or wax, call Poison Control at 1-800-222-1222 right away.

Air Freshener FAQs

Are plug-in air fresheners bad for you?

Plug-in air fresheners are among the worst choices because they release fragrance continuously. Exposure does not happen once; it continues hour after hour in the room where your family breathes, sleeps, plays, and works.

Are air fresheners bad for your lungs?

Yes, they can be, especially if you have asthma. Weekly use of scented products and sprays was tied to higher odds of current asthma in more than 41,000 French adults, and in the 2022 French study, sprays drove fine particles (PM2.5) above 100 micrograms per cubic meter. (8, 1)

Are scented candles and wax melts toxic?

Both add pollutants to indoor air. Wax melts have no flame, but in 2025 Purdue researchers found their fragrance formed nanoparticle levels comparable to burning candles and gas stoves. (2) If you love a warm scent, simmer citrus peels, cinnamon sticks, and cloves on the stove instead.

Is fragrance-free better than unscented?

Yes, usually. Fragrance-free generally means no fragrance ingredients were added for scent. Unscented means the product has no noticeable smell, but it may still contain masking fragrance ingredients. Always read the full ingredient list.

What is the fastest healthy home swap?

Throw out plug-in air fresheners, aerosol sprays, synthetic candles, dryer sheets, and laundry scent beads. Replace them with fragrance-free laundry products, wool dryer balls, open windows, a diffuser used wisely, and a simple DIY room spray.

For more on caring for the body God gave you, from what you breathe to what you eat, join us at Bible Health.

Keep reading: Homemade Floor Cleaner With Essential Oils · Homemade All-Purpose Cleaner With Essential Oils · How to Detox Your Body From Mold Naturally: 6 Recovery Pillars