Infrared saunas are often chosen to support detox and recovery. What’s rarely considered is how heat changes the air inside the cabin, and why materials matter once temperatures rise.
Key Takeaways
- VOCs are an indoor air quality issue. Many common building materials and finishes release VOCs, often at higher concentrations indoors than outdoors.
- Heat changes emissions. As temperatures rise, materials can release VOCs more quickly, making construction choices especially relevant in heated environments like infrared saunas.
- Not all saunas are built the same. Engineered woods, chemical glues, and treated composites are common sources of VOCs under heat.
- Breathing matters during heat exposure. Deeper, sustained breathing can increase inhalation of airborne compounds present in the cabin.
- Safety is evaluated through materials and testing. Solid, untreated wood and independent third-party VOC or emissions testing are key indicators of cleaner sauna air.
- Design choices set the baseline. Saunas built without VOC-emitting materials, and verified through testing, help ensure that the benefits of infrared heat are not offset by avoidable exposures.
Air quality is one part of choosing the right sauna. Our complete infrared sauna buying guide also explains how to evaluate heater technology, EMF testing, wood construction, red light therapy, operating temperature, and warranty support.
Understanding VOCs as Part of Indoor Health
Volatile organic compounds (VOCs) are carbon-based chemicals that readily evaporate into the air. In residential and commercial environments, they are most commonly released from building materials, adhesives, finishes, cleaning agents, and personal care products [1][2].
Because people spend most of their time indoors, long-term exposure to VOCs is largely driven by indoor air quality rather than outdoor pollution. Research across environmental health and occupational hygiene consistently shows that indoor VOC concentrations are often higher than those found outdoors [3][4]. Depending on the compound and exposure level, health effects may include respiratory irritation, headaches, fatigue, and, in some cases, increased risk of chronic disease [5][6].
These exposures are rarely obvious. VOCs are often colorless and odorless, and their effects tend to accumulate gradually. For this reason, indoor air quality is increasingly recognized as a meaningful component of overall wellness, even when no immediate symptoms are present [7].
Why Temperature Changes VOC Emissions
Material behavior shifts as temperatures rise. One of the most established findings in indoor air quality research is that heat increases the rate at which many materials release VOCs into the surrounding air [8]. This process is commonly described as thermal desorption.
Infrared heat has been studied in materials science for its ability to accelerate VOC release from wood-based and composite products [9]. In controlled environments, infrared radiation is sometimes used intentionally to force VOCs out of engineered materials before installation.
In a heated indoor space, the same principle applies. If materials contain VOCs, elevated temperatures increase the likelihood that those compounds will enter the air during use [10].
Potential VOC Sources in Infrared Sauna Construction
Infrared saunas are enclosed environments designed for repeated heat exposure. As with any indoor space, air quality depends on the materials used to build it [11].
Research in wood science and industrial hygiene identifies several construction elements that are commonly associated with VOC emissions:
- Adhesives and bonding agents: Many industrial glues contain formaldehyde or related compounds. Emission rates increase significantly when these materials are heated [12][13].
- Engineered wood products: Plywood, particle board, and oriented strand board rely on synthetic resins that off-gas under thermal stress [14].
- Heater components and insulation: Some lower-grade infrared heaters use plastics, fiberglass, or chemical coatings that can release vapors when exposed to sustained heat [15].
When these materials are present in a compact cabin, airborne concentrations may rise during longer sessions, particularly as breathing rate increases with heat exposure [16].
The Balance Between Detoxification and Exposure
Sauna use is often discussed in clinical and wellness literature for its role in supporting circulation, relaxation, and the elimination of certain substances through sweat [17]. Studies have shown that heavy metals and some chemical residues can be excreted during sauna sessions [18].
At the same time, environmental health research emphasizes that inhalation remains a primary exposure pathway for VOCs [19]. In a heated environment, deeper and more frequent breathing increases the amount of air, and any contaminants it carries, that enters the body.
This does not negate the benefits of infrared sauna use. Instead, it highlights the importance of minimizing avoidable sources of exposure so that the intended benefits of heat are not offset by indoor air quality concerns [20].
How VOC Safety Is Evaluated in Infrared Saunas
Because there is limited peer-reviewed research measuring VOC concentrations across every infrared sauna model during active use, experts rely on established indoor air quality assessment methods [21].
Key indicators include:
- Independent VOC testing: Measurements conducted by third-party laboratories rather than internal assessments [22].
- Emissions chamber testing: Evaluation of the full sauna unit in a sealed environment to measure total airborne emissions under heat [23].
- Material disclosure: Use of solid, untreated wood without plywood, MDF, or chemical adhesives, which are widely recognized in indoor air quality research as lower-emission options [24].
Together, these criteria provide a practical framework for evaluating sauna construction beyond surface-level features.
Where Wellness and Materials Meet
Some manufacturers design infrared saunas with material behavior under heat in mind, recognizing that elevated temperatures can influence how the indoor environment performs over time [8][10]. In these cases, construction choices are approached not only from a durability standpoint, but from the perspective of air quality during use.
This often includes the use of solid, untreated wood in place of engineered materials, along with the avoidance of chemical adhesives and treated composites that may release VOCs when heated [12][14]. Independent third-party testing is sometimes used to evaluate how these decisions translate into actual emissions within a closed, heated cabin [22][23].
As heat increases and breathing naturally deepens, these factors become part of the overall experience [16]. The cabin does not simply contain the session; it influences how the body responds within it.
This approach reflects a broader shift in how wellness environments are considered. Material selection and verification are becoming part of the baseline, rather than an added feature [21][24].
At JNH Lifestyles, sauna construction follows this same line of thinking. Solid Canadian Hemlock and Red Cedar are used in place of engineered woods, and VOC-emitting glues, plywood, MDF, and treated composites are avoided [25][26]. Each sauna is also independently tested to confirm that emissions remain low during use[27].
Wellness should not require the body to compensate for avoidable exposures. A sauna should support the intended benefits of infrared heat in a space designed with equal attention to what you breathe.
A More Informed Approach to Infrared Sauna Use
As interest in infrared saunas continues to grow, conversations around materials and indoor air quality are becoming more central to informed wellness decisions. Understanding VOCs is not about alarm. It is about recognizing how the environment and physiology interact.
When recovery spaces are designed with the same care as the routines practiced inside them, the benefits of heat can be experienced with greater confidence and clarity.
What considerations matter most to you when choosing the spaces that support your daily wellness?
Frequently Asked Questions
What are VOCs, and why do they matter in an infrared sauna?
VOCs, or volatile organic compounds, are chemicals that can be released into the air from materials such as wood composites, adhesives, finishes, and plastics. In an infrared sauna, elevated temperatures can increase the rate at which these compounds are released. Because sauna use involves sustained heat and deeper breathing, indoor air quality becomes especially relevant [1][2][10].
Do all infrared saunas release VOCs?
Not all infrared saunas release VOCs at the same levels. Emissions depend largely on how the sauna is constructed [11][14]. Saunas made with engineered woods, chemical glues, or treated materials are more likely to off-gas when heated, while those built with solid, untreated wood and low-emission components tend to have significantly lower VOC levels [25][26].
What materials are most associated with VOC emissions in saunas?
Common sources include plywood, particle board, MDF, chemical adhesives, and certain plastics or insulation materials used near heaters [12][13][15].
What type of wood does JNH Lifestyles use in its infrared saunas?
JNH Lifestyles infrared saunas are built using solid, untreated Canadian Hemlock or Red Cedar [25].
Why is third-party testing important for sauna air quality?
Third-party testing provides an objective assessment of emissions under real-world conditions [22][23].
Can VOC exposure offset the benefits of infrared sauna use?
Infrared saunas support relaxation, circulation, and recovery, but inhalation remains a primary exposure pathway for VOCs [19]. Minimizing avoidable emissions helps ensure that the benefits of heat are experienced safely.
Is a low-VOC sauna necessary for everyone?
Sensitivity to VOCs varies. Individuals with asthma, chemical sensitivities, or a focus on indoor air quality may be particularly attentive to materials and testing [5][6].
What should consumers look for when evaluating infrared sauna safety?
Look for transparent material sourcing, avoidance of engineered woods and chemical adhesives, and independent third-party VOC or emissions testing conducted under heated conditions [21][24].
References
[1] Alford, K. L., & Kumar, N. (2021). Pulmonary health effects of indoor volatile organic compounds—A meta-analysis. International Journal of Environmental Research and Public Health, 18(4), 1578.
[2] Wahlang, B. (2021). Associations between residential exposure to volatile organic compounds and liver injury markers. Toxicological Sciences, 185(1), 50–63.
[3] Chin, J.-Y., Godwin, C., et al. (2014). Levels and sources of volatile organic compounds in homes of children with asthma. Indoor Air, 24(4), 403–414.
[4] Cheng, S., Chang-Chien, G.-P., et al. (2019). Global research trends in health effects of volatile organic compounds during the last 16 years. Aerosol and Air Quality Research, 19(8), 1834–1843.
[5] Gupta, N., et al. (2024). Hospital-borne hazardous air pollutants and air cleaning strategies. Heliyon, 10(18), e38874.
[6] Ogbodo, J. O., et al. (2022). Volatile organic compounds: A proinflammatory activator in autoimmune diseases. Frontiers in Immunology, 13, 928379.
[7] Potera, C. (2011). INDOOR AIR QUALITY: Scented products emit a bouquet of VOCs.
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