6 min
Paint, flooring, and joinery are usually chosen for how they look. Once installed, those same materials can release VOCs and formaldehyde into your indoor air for months or even years. Asking what a finish adds to the air, not just the room, is the difference between a beautiful space and a healthy one.
When people choose materials for a home, office, or hospitality space, they usually compare the visible things first.
How the floor looks in natural light.
Whether the paint tone feels too warm or too cool.
If the joinery finish feels timeless enough to live with for years.
These are normal decisions. They are also only part of the picture.
Because materials do not just shape how a room looks. They also shape what the room releases into the air once everything is installed.
Most people are never told to ask that question at the start of a project. Some only discover it later, after a renovation that never quite feels settled, or after learning that the products around them were doing more than they appeared to.
That is what makes this worth understanding early.
A material choice is never purely aesthetic. It becomes part of the environment itself.
Most material choices are made without the information that matters later
A typical specification process focuses on finish, durability, maintenance, lead time, and cost. All of these matter. None of them are enough on their own.
Many interior materials continue affecting the space long after installation. Paints, adhesives, flooring systems, varnishes, sealants, joinery substrates, and treated textiles can all release compounds into the air over time, often most heavily in the first weeks and months after completion.
And yet this part of the conversation is often missing.
So a project may be highly precise about colour, texture, pricing, and wear, while remaining remarkably vague about something that will shape the lived experience of the room far more quietly and far more persistently: the kind of indoor atmosphere those materials will create once people begin living or working inside the space.
This is where many projects are more superficially resolved than they first appear.
Not because the design lacks quality. Because the brief asked too little of the materials.
What interior materials can add to the air around you
Volatile organic compounds, or VOCs, are chemicals that evaporate at room temperature and enter indoor air from many products commonly used in interiors. Paints, varnishes, adhesives, flooring finishes, sealants, pressed wood products, upholstery treatments, and even certain cleaning products can all contribute.
For a client, the most useful point is not the definition itself. It is the implication.
Two materials can look almost identical and still create very different air conditions once installed.
That difference is not visible on a sample board. It will not declare itself in a showroom. It will not appear in the persuasive coherence of a well-composed material palette. Unless it is being checked deliberately, it can disappear from the decision entirely.
And yet the information usually exists. It sits in a technical data sheet, often treated as secondary to the sample itself.
So one of the most consequential qualities of a material is also one of the least likely to be examined closely enough before approval.
Why ordinary joinery can become an invisible problem
This becomes much easier to understand once you look at where these materials actually appear.
Formaldehyde is one of the best-known indoor pollutants associated with building and interior materials. It is commonly linked to the adhesive resins used in pressed wood products such as particleboard, MDF, and certain plywoods.
In practice, that means the issue is often embedded in very standard parts of a project:
kitchen cabinetry, wardrobes, shelving, vanity units, media walls, floor underlays.
That is precisely what makes it important.
The concern is not that people are choosing obviously problematic products. It is that entirely ordinary specification decisions can accumulate into a more chemically burdened interior than anyone intended. A kitchen in one room, storage in another, shelving elsewhere. Each decision feels routine. Together, they begin shaping the air in the finished space.
The off-gassing is often highest in the first weeks and months after installation, but some materials can continue releasing measurable amounts for far longer.
So this is not only a question for the first days after handover. It can still matter long after the project starts to look settled.
For many people, that is the uncomfortable part: the realisation that the decisions most likely to affect the atmosphere of the room were also the ones that felt the most ordinary.
Why compliant is not always good enough
This is where a better specification process begins to separate itself from a standard one.
Yes, emissions standards exist. Yes, they matter. They have improved the market and raised the floor. That should not be dismissed.
But compliance is a minimum. It is not a guarantee of suitability.
A material can meet a regulatory threshold and still be the wrong choice for a bedroom, a home office, a hotel room, or any interior where people spend long and repeated hours. Regulation generally asks what can be permitted. A more intelligent design process asks what is appropriate for this space, for these users, over time.
That distinction sits at the core of the WELL Building Standard’s Materials concept. It moves the conversation beyond legal acceptability and toward health-based criteria, ingredient transparency, and verification of air quality after installation.
That changes the logic of the decision.
The question stops being only: Can this product be used?
It becomes: Is this a material we want shaping the air of this room every day?
That is a different standard of care entirely.
What we are really specifying is the atmosphere of the room
At τoπos design studio, material selection is not approached as a visual exercise with technical notes added later.
We review emissions data before finishes are approved. That means requesting technical information alongside samples, checking VOC and formaldehyde data against WELL-aligned criteria, and excluding products that do not meet the required thresholds, even when they succeed visually or appear familiar from other projects.
This does add another layer to the process. It also removes a much greater uncertainty later: not knowing what the completed interior will continue releasing into the air once people move in.
In many cases, healthier alternatives are available within a commercially reasonable range. They are not always identical in cost, and not every substitution is effortless, but they are usually far more accessible than clients assume.
The real issue is seldom the absence of better options. It is whether the right question was asked early enough.
Because once materials are being judged only by how they look, what they cost, and how quickly they can be delivered, part of the room has already been decided too narrowly.
Before you approve the palette, ask this
Before the paint colour is signed off.
Before the joinery drawings are final.
Before the sample board becomes convincing simply because it looks coherent.
Pause on one question:
What will these materials contribute to the air of the room once everything is installed?
That question changes the level of the conversation immediately.
It moves the discussion beyond appearance and into consequence. It reminds everyone involved that materials are not passive once installed. They become part of the interior climate of the space.
And that is the real shift.
A better project is not only one with better taste.
It is one with better questions while choices are still easy to improve.
When the room finally feels settled
The kitchen is opened in the morning and the air feels neutral. The bedroom no longer carries the trace of recent works months after completion. The built-ins, paint, flooring, and finishes have receded into the background in the way good design should.
The room feels easier.
Not because anyone is thinking consciously about VOCs. But because the space is no longer quietly working against them. The air feels cleaner. The atmosphere feels calmer. The room has the kind of ease that is difficult to manufacture once the wrong materials have already been installed.
That is the outcome this conversation is really about.
Not fear. Not perfection.
Just a more informed way of making material decisions before they become fixed, expensive, and part of everyday life.
What should your material palette do beyond looking good on a board?
