There’s a distinctive smell that hits when you walk into a nail salon — a sharp, chemical combination that most people register and then stop noticing within a few minutes. That adaptation isn’t the same as the compounds disappearing. The products being applied in a nail salon — polish, remover, gel, acrylic, primer, adhesive — release volatile compounds into the air continuously during application, in a space that is often small and variably ventilated. For clients, the exposure is occasional. For the people who work there daily, it’s a different picture entirely.
Nail products are one of the more overlooked personal care exposure categories. The combination of direct skin contact, inhalation during application, and UV exposure during gel curing makes the ingredient profile worth understanding — whether you do your nails at home or visit a salon regularly.
What’s in Conventional Nail Polish
Conventional nail polish is a solvent-based formulation — it applies as a liquid and dries as the solvents evaporate, leaving a film-forming compound behind on the nail surface. That drying process is part of what releases volatile compounds into the air during and after application.
The ingredient concerns in conventional nail polish have historically centered on three compounds known as the toxic trio — formaldehyde, toluene, and dibutyl phthalate, commonly abbreviated as DBP.
Formaldehyde is used in some nail polishes as a nail hardener — it cross-links the keratin in the nail plate to create a harder surface. It’s a known human carcinogen, classified as such by the International Agency for Research on Cancer, and a well-documented skin and respiratory sensitizer. Baran’s foundational review of nail cosmetic allergies and irritations documented formaldehyde as one of the primary sensitizing agents in nail products — capable of triggering both contact dermatitis and respiratory reactions with repeated exposure.
Toluene is a solvent used to keep nail polish smooth and applied evenly. It evaporates during drying — which is what makes it primarily an inhalation concern rather than a skin contact one. Toluene is a neurotoxin at high concentrations and has been associated with reproductive effects including developmental harm during pregnancy. It’s one of the more volatile compounds in conventional nail polish formulations, meaning it enters the air quickly during application.
Dibutyl phthalate — DBP — is a plasticizer used to prevent polish from becoming brittle and chipping. As covered in What Are Phthalates — and Where Do They Show Up, DBP is a documented endocrine disruptor with reproductive toxicity concerns. It’s been restricted in nail cosmetics in the EU but remains permitted in the U.S. at concentrations used in most conventional formulations.
Dinani and George’s dermatological review of nail cosmetics documented the range of allergic and irritant reactions associated with nail polish ingredients — noting that sensitization can develop gradually with repeated exposure rather than appearing immediately, which means reactions that seem sudden often reflect cumulative sensitization built up over time.
Free-from labeling has become standard marketing in nail polish — “3-free,” “5-free,” “7-free,” and “10-free” claims indicate that a product excludes a defined list of ingredients. A 3-free polish excludes formaldehyde, toluene, and DBP. Each higher number adds more excluded ingredients to that baseline list. These claims are self-applied and not independently verified — they reflect the brand’s own formulation decisions rather than a certified standard. Huang et al.’s 2026 laboratory analysis of nail product chemicals found that the chemical profiles of nail products don’t always align with their marketing claims — reinforcing the value of third-party verification over label language alone.
Nail Polish Remover
Nail polish remover works by dissolving the film-forming compounds in polish — breaking down the same coating that makes polish durable. The most commonly used solvent for this is acetone.
Acetone is effective, fast-acting, and relatively well-characterized from a toxicological standpoint — it’s produced naturally by the human body as a metabolic byproduct and is considered lower concern than many other nail product solvents at typical use concentrations. Its primary concerns are drying to the nail and surrounding skin with repeated use, and inhalation of vapors in enclosed spaces during application.
Non-acetone removers are marketed as gentler alternatives — but the solvents used in their place, including ethyl acetate and isopropyl alcohol, come with their own inhalation profiles and are not necessarily lower concern in enclosed spaces. Scott, Elston, and Burkhart’s 2025 review of health threats in the nail industry noted that the substitution of acetone with alternative solvents in non-acetone removers doesn’t automatically reduce the overall VOC burden in the application environment — the solvents differ but the volatility concern remains.
Using nail polish remover in a well-ventilated space — near an open window or with a fan running — is the most practical mitigation for the inhalation concern regardless of which type is used.
Gel and Acrylic Products
Gel and acrylic nail systems present a more complex and more intense exposure profile than regular polish — both in terms of the compounds involved and the application process.
Gel nail systems use methacrylate compounds — specifically hydroxyethyl methacrylate (HEMA) and related compounds — as the primary film-forming ingredients. These compounds cure — harden — under UV or LED light rather than air-drying. Pompecki, Balakirski, and Löser’s 2025 review of nail cosmetics risks documented methacrylates as significant contact allergens — capable of causing both allergic contact dermatitis and occupational sensitization with repeated exposure. Once sensitization develops to methacrylates, it can extend to other methacrylate-containing products including some dental materials and medical adhesives — a cross-reactivity concern that makes methacrylate sensitization more significant than most single-ingredient sensitivities.
The UV curing step in gel manicures introduces an additional exposure concern beyond the polish itself. UV nail lamps emit UV-A radiation — the same wavelength associated with skin aging and DNA damage in skin cells. The hands are exposed at close range during the curing process, and repeated sessions accumulate that UV exposure across the skin of the hands and fingers. Some gel systems have moved toward LED curing, which uses a narrower wavelength range than UV lamps — but both emit radiation that reaches the skin around the nails during curing.
Acrylic nail systems combine a liquid monomer — typically ethyl methacrylate — with a powder polymer to create a sculptable material that hardens through a chemical reaction rather than UV curing. The liquid monomer is highly volatile — it evaporates rapidly during application, releasing methacrylate compounds into the salon air at higher concentrations than most other nail products. Baran’s review documented ethyl methacrylate as a significant sensitizer and respiratory irritant — noting that the occupational exposure profile for nail technicians applying acrylic systems is among the more significant in the personal care industry.
Primers used in acrylic application — which prepare the natural nail surface to bond with the acrylic — often contain methacrylic acid, a corrosive compound that can cause chemical burns on skin and is a potent respiratory irritant during application.
Salon Air Quality
The air quality in a nail salon during operation is a function of how many products are being applied simultaneously, how volatile those products are, and how effectively the space is ventilated.
Huang et al.’s 2026 laboratory analysis of chemicals in nail products used exposure assessment modeling to evaluate the range of compounds present in salon environments during typical service conditions. Their findings documented a significant VOC burden from the combination of polish, remover, gel, and acrylic products applied across multiple stations simultaneously — with several compounds present at concentrations that warrant attention from both an acute inhalation and a cumulative chronic exposure standpoint.
The ventilation of a nail salon is the primary determinant of how much of that VOC burden clients and workers actually inhale. A salon with effective local exhaust ventilation at each station — systems that capture vapors at the point of application rather than relying on general room ventilation — dramatically reduces exposure compared to a salon that relies on open windows or general air conditioning. Scott, Elston, and Burkhart’s review of nail industry health threats noted that ventilation quality varies widely across salons and that many smaller operations operate with inadequate local exhaust ventilation, creating environments where VOC accumulation during peak hours is meaningful.
For clients choosing a salon, observable signs of ventilation quality include air filtration units at work stations, visible exhaust systems, and the absence of a heavy chemical smell that persists throughout the visit. A strong chemical smell that doesn’t dissipate is a signal that ventilation isn’t effectively removing what the products are releasing.
For Nail Salon Workers
The exposure picture for nail salon workers is categorically different from the client experience — and it’s worth addressing separately because the research on this population provides some of the strongest evidence available for nail product health effects.
Nail technicians work in salon environments for full shifts, multiple days a week, across years of employment. The compounds that clients encounter for an hour during an occasional appointment are present for nail technicians throughout their working hours. Scott, Elston, and Burkhart’s 2025 review documented the range of health concerns associated with occupational nail salon exposure — including elevated rates of respiratory symptoms, skin sensitization and dermatitis, musculoskeletal issues from positioning, and reproductive health concerns in pregnant workers. Their review noted that nail salon workers — who are disproportionately women of reproductive age and frequently from immigrant communities — face occupational chemical exposures that are significantly higher than general population exposure through personal use of the same products.
Pompecki et al.’s review similarly documented the occupational sensitization risk for nail technicians — particularly for methacrylate compounds in gel and acrylic systems, where the frequency and intensity of exposure in a professional setting creates sensitization risk that occasional personal use at home doesn’t approach.
This population-level data on nail salon workers is worth knowing not only as an occupational health concern but as a window into what the compounds in these products do at sustained exposure levels — evidence that doesn’t exist for the general consumer population because consumer exposure is less frequent and less measurable.
What to Look for in Safer Alternatives
For nail polish, water-based formulations are the most transparent available alternative — they use water rather than organic solvents as the primary carrier, which reduces the VOC burden during application and drying significantly. Their durability and finish differ from conventional solvent-based polish, but for those prioritizing reduced chemical exposure over longevity, they represent a meaningful reduction in the inhalation and skin contact concerns associated with conventional formulations.
For conventional polish, free-from claims are a useful starting point — a 5-free or higher formulation excludes the toxic trio plus additional compounds of concern. Their limitation is that they’re self-applied without independent verification, and as Huang et al.’s analysis found, chemical profiles don’t always align with marketing claims. Looking for brands that have pursued third-party testing and publish their results goes further than label language alone.
For gel systems, choosing salons that use HEMA-free gel formulations reduces the primary methacrylate sensitization concern. HEMA-free gel systems use larger methacrylate molecules that don’t penetrate the nail as readily — reducing the sensitization risk without eliminating the gel format entirely. Applying a UV-blocking glove or sunscreen to the hands before gel curing addresses the UV exposure concern during the curing step.
For salon visits generally, asking about ventilation before booking — whether the salon uses local exhaust ventilation at stations rather than relying on general room airflow — is worth doing, particularly for regular appointments. Choosing less-enclosed times of day, sitting near ventilation sources, and avoiding acrylic services in spaces with inadequate ventilation reduces the VOC inhalation exposure that salon air quality doesn’t otherwise control.
A Category Worth Knowing
Nail products are applied directly to skin, inhaled during application and drying, and in the case of gel systems, exposed to UV radiation during curing — a combination of exposure routes that makes their ingredient profile more relevant than their occasional use might suggest. The research on nail salon workers provides some of the strongest available evidence for what these compounds do at sustained exposure levels — and the findings are significant enough to inform choices about both products and salon environments even for people who use nail services occasionally.
The references used in this article are a starting point — we encourage you to read further and draw your own conclusions.
The framework is one piece of the picture. Browse our Personal Care articles to build on what you know — and make more informed choices about what goes on your body.
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