VOCs: The Chemicals You Smell and How They Make You Feel

Last updated September 24, 2026 · Monitor My Air

That new-paint, new-furniture, or fresh-cleaning-product smell is often VOCs. At the levels found in many homes they can cause headaches, irritation, and dizziness, and they are usually easy to reduce.

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What's going on

VOCs, volatile organic compounds, are chemicals that evaporate easily into the air at room temperature. They come from paint, new furniture and flooring, adhesives, cleaning products, air fresheners, scented candles, and more. That distinctive smell of a freshly painted room or a new sofa is often VOCs off-gassing into your air.

Most VOC exposure at home is not dramatic, but it is real. Higher levels can cause headaches, dizziness, and irritation of the eyes, nose, and throat, and can aggravate asthma. The good news is that VOCs respond quickly to simple actions.

Why it matters to you

VOCs matter because they are common, often unnecessary, and easy to reduce:

Short-term effects at elevated levels include headaches, dizziness, nausea, and irritation of eyes, nose, and throat.
They can worsen asthma and bother sensitive people, children, and older adults more.
Some specific VOCs, like formaldehyde and benzene, are of greater concern at higher or prolonged exposures, which is why fresh products and poor ventilation deserve attention.

For context, indoor VOC levels are generally considered good under about 250 ppb. Levels spike after painting, installing new furnishings, or heavy cleaning, then fall over hours to weeks as materials off-gas and air exchanges. The encouraging part is how responsive VOCs are: unlike a hidden structural problem, most VOC spikes clear on their own once you stop adding to them and let fresh air through. You are rarely stuck with them, which makes this one of the easier wins in the home.

What to actually do

Ventilate, especially after painting, bringing in new furniture, or cleaning. Open windows and run fans to flush the air out.
Let new items off-gas. Air out new furniture, mattresses, and flooring, ideally in a ventilated space, before heavy use.
Choose low-VOC or no-VOC paints and products when you can. It is one of the simplest upgrades.
Go easy on air fresheners, scented candles, and heavily fragranced cleaners. A pleasant smell is not the same as clean air; it often means you are adding VOCs.
Store paints, solvents, and fuels sealed and outside living areas, such as in a detached garage or shed.
If you are sensitive, notice which products trigger symptoms and swap them out.
When renovating or moving into a freshly finished space, ventilate generously for the first days and weeks, when off-gassing is at its highest.

When it's serious

Persistent headaches, dizziness, or nausea that improve when you leave and return at home, especially after new products or renovation.
Worsening asthma or breathing symptoms linked to specific products or a freshly renovated space.
Any exposure that causes strong symptoms like confusion or breathing difficulty. Get to fresh air and seek medical care.

This is education to help you understand and act, not a medical diagnosis.

What professionals know

VOCs are a large, chemically diverse class, and their health relevance depends heavily on the specific compound and concentration. Total VOC (TVOC) measurements, often reported in ppb by consumer monitors, are useful as a relative indicator of air freshness and ventilation adequacy but are a crude health metric because they lump together compounds of very different toxicity. A TVOC reading is best used to detect elevations and confirm that ventilation brings them down, rather than as a precise risk figure.

Acute sensory and irritant effects, headache, dizziness, and mucous-membrane irritation, are well documented at elevated indoor concentrations and are the effects most people notice. Certain individual VOCs carry more specific concern: formaldehyde (from pressed-wood products, some insulation and textiles) is a known respiratory irritant and classified carcinogen with established indoor guideline values; benzene (from tobacco smoke, attached garages, some products) is a known carcinogen. These specific compounds justify attention to source control and ventilation, particularly during and after renovation.

The dominant exposure dynamic indoors is off-gassing followed by decay: new materials emit at high initial rates that decline over days to months, and concentrations are governed by the balance between emission and air-exchange rate. This is why ventilation is the most effective and immediately verifiable control. Source substitution (low-VOC paints and finishes, avoiding unnecessary fragranced products) reduces the emission side.

What is not well supported is the notion that typical household VOC exposure causes chronic multi-system illness in healthy adults; the robust evidence concerns acute irritant and neurological symptoms at elevated levels and long-term risk from specific carcinogenic compounds at sustained exposures. Multiple chemical sensitivity, in which very low VOC levels are reported to trigger severe symptoms, is described by many patients but remains a contested, non-established diagnosis. As elsewhere, the practical, evidence-aligned response is source reduction plus ventilation, with medical evaluation for symptoms rather than presumptive attribution.

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