How to Reduce VOCs Indoors “Naturally” – Plants, Ventilation, and Safer Cleaning>>>

By INDEX Editorial Team | Based on peer-reviewed research –

If you’ve ever walked into a freshly painted room and felt your eyes water, or noticed a chemical scent wafting from new furniture or equipment, you’ve met volatile organic compounds — VOCs for short. They’re invisible, they’re pervasive, and according to the U.S. Environmental Protection Agency, their concentrations indoors can run two to five times higher than outdoors — sometimes spiking to 1,000 times background levels immediately after activities like paint stripping.

The good news is that reducing VOCs does not demand a full home or office remodel or expensive equipment. A growing body of peer-reviewed research and guidance from organizations like the EPA and the American Lung Association points to three accessible, natural strategies that work in combination: strategic ventilation, safer cleaning products, and — in a supporting role — the right houseplants.

This guide walks through each strategy using a criteria-first framework: first, we’ll establish what to look for and why it matters based on independent research. Then we’ll map that to practical, actionable steps. No alarmism. No product endorsements. Just science and sensible pathways forward.

What Are VOCs — and Why Should You Care?

Volatile organic compounds are carbon-based chemicals that readily evaporate at room temperature. They off-gas from thousands of everyday household sources:

• Paints, varnishes, and solvents
• Cleaning products and disinfectants
• Air fresheners and scented candles
• Pressed-wood furniture and composite building materials
• Dry-cleaned clothing
• Glues, markers, and craft supplies
• Cooking fumes and gas stove emissions

The EPA identifies a range of health effects associated with VOC exposure. Short-term symptoms include eye, nose, and throat irritation, headaches, dizziness, and nausea. Long-term or repeated exposure to certain VOCs — particularly formaldehyde and benzene — has been linked to damage to the liver, kidneys, and central nervous system. Some are classified as known or suspected human carcinogens.

Children, older adults, and people with pre-existing respiratory conditions face elevated risk. As the American Lung Association notes, children breathe more air relative to their body size, which means they inhale a proportionally higher dose of whatever is circulating indoors.

Here’s the central problem: Americans spend approximately 90% of their time indoors, and the EPA’s TEAM (Total Exposure Assessment Methodology) studies consistently found indoor VOC levels two to five times higher than outdoor levels — regardless of whether the home or building was in a rural area or an industrial corridor. VOCs don’t respect geography. They respect sources, and the source is often inside.

The 3-Layer Strategy: A Criteria-First Framework

Not all VOC-reduction strategies are created equal. Drawing on the EPA’s hierarchy of controls and current peer-reviewed evidence, we’ve organized the three natural approaches into a layered framework:

Each layer reinforces the others. None is a silver bullet on its own.

Layer 1: Ventilation — The Most Powerful Tool You Already Have

The Science

Ventilation is the undisputed heavyweight champion of VOC reduction. When researchers at Drexel University analyzed decades of indoor air quality data in a 2019 landmark study published in the Journal of Exposure Science & Environmental Epidemiology, they found that natural building ventilation diluted VOCs roughly 1,000 to 10,000 times faster than a single potted plant could remove them. The takeaway isn’t that plants are useless — it’s that ventilation is extraordinarily effective.

The EPA’s first and most emphatic recommendation for reducing VOC exposure is: “Increase ventilation when using products that emit VOCs.”

ASHRAE Standard 62.2, the benchmark for residential ventilation, recommends a minimum of 7.5 cubic feet per minute (cfm) per occupant plus 3 cfm per 100 square feet of living space. In practice, most homes — especially those built to tighter modern energy codes — fall short of this without active intervention.

What to Look For: 5 Ventilation Criteria

When evaluating your home’s ventilation strategy, consider these evidence-based criteria:

1. Air exchange rate: Aim for at least 0.35 air changes per hour (ACH) — the ASHRAE 62.2 residential* minimum. For context, opening two opposing windows on a breezy day can achieve 5–10 ACH.
2. Cross-ventilation capacity: The most efficient natural ventilation occurs when air can flow from one side of a room to the other. A single open window improves air quality. Two windows on opposite walls transform it.
3. Spot ventilation: Kitchen and bathroom exhaust fans should vent to the outdoors (not the attic). ASHRAE recommends intermittent kitchen exhaust of at least 100 cfm and bathroom exhaust of at least 50 cfm.
4. Post-activity purging: After painting, using solvents, or introducing new furniture, ventilate aggressively for 48–72 hours — not just during the activity. VOCs continue to off-gas long after the work is done.
5. Outdoor air quality awareness: On high-pollution days, ventilation becomes a trade-off. Check the Air Quality Index (AQI) at airnow.gov before opening windows, particularly if you live near wildfire zones or major traffic corridors.

*ASHRAE does not prescribe a single “one-size-fits-all” Air Change Rate per Hour (ACH) for general buildings. Instead, minimum ventilation requirements depend on the building type, occupancy density, floor area, and special health/safety standards.

Practical Pathways

• The 10-minute rule: Open windows for at least 10 minutes every morning, even in winter. This single habit can reset indoor VOC concentrations from overnight accumulation.
• Cook with the exhaust on — every time: Gas stoves are a significant source of nitrogen dioxide and VOCs. Run the range hood from the moment you ignite the burner until 10 minutes after you’re done.
• Create a “new product off-gassing zone”: Unwrap new furniture, rugs, or mattresses in a garage or covered outdoor space for 7–10 days before bringing them inside. The American Lung Association specifically recommends this practice for pressed-wood furniture and upholstered items.
• Bathroom fans aren’t just for showers: Run bathroom exhaust fans for 20–30 minutes after using aerosol products, nail polish, or any VOC-emitting personal care item.

Key principle: Ventilation isn’t an event — it’s a rhythm. Consistency matters more than intensity.

Layer 2: Safer Cleaning — Eliminating a Daily Source

The Science

Conventional cleaning products are among the most frequently encountered VOC sources indoors. Aerosol sprays, disinfectants, degreasers, and even some products marketed as “green” can release VOCs during and after use. The EPA classifies cleaning products right alongside paints and solvents as significant indoor VOC contributors.

The good news: cleaning is a controllable source. Unlike building materials embedded in your walls, cleaning products are discretionary purchases. Every time you choose a low-VOC alternative, you eliminate a recurring emission event.

What to Look For: 8 Criteria for a Lower-VOC Cleaner

Independent data suggests consumers should evaluate household cleaners against the following criteria. A product that meets most or all of these is substantially less likely to contribute to indoor VOC burden:

1. No petrochemical solvents: These are among the most common VOC emitters in conventional cleaners. Look for plant-derived surfactants instead.
2. Fragrance-free or unscented: “Fragrance” on a label can mask dozens of undisclosed chemicals, many of which are VOCs. Even “natural” fragrances from essential oils can contribute to indoor chemistry reactions.
3. No aerosol propellants: Pump sprays or concentrates that you dilute yourself avoid the VOC-heavy propellants used in aerosol cans.
4. USDA A-1 or food-area rated: A product rated safe for use around food preparation surfaces has passed meaningful safety thresholds.
5. No formaldehyde-releasing preservatives: Ingredients like DMDM hydantoin, quaternium-15, and bronopol can slowly release formaldehyde into indoor air.
6. Biodegradable formulation: While biodegradability doesn’t directly reduce VOCs, it correlates with simpler, less synthetic formulations.
7. Transparent ingredient disclosure: A manufacturer willing to list every ingredient — not just “cleaning agents, fragrance, preservatives” — signals accountability.
8. Concentrated format: Concentrates reduce packaging, shipping emissions, and the total chemical volume you’re introducing into your space per use.

Practical Pathways Beyond Product Choice

• Ditch the air fresheners entirely: Plug-in air fresheners, scented candles, and aerosol room sprays are major VOC emitters. If you want fragrance, simmer cinnamon sticks and orange peels on the stove. Open windows. That’s it.
• Microfiber + water for daily surfaces: For everyday dust and light soil, a high-quality microfiber cloth dampened with water removes particulates and residues without introducing any chemicals at all.
• Store cleaning products outside living spaces: Even sealed containers emit trace VOCs. Store cleaners in a ventilated garage, basement utility closet, or outdoor storage — not under the kitchen sink.

Layer 3: Plants — The Supporting Player

The Science (With Nuance)

Few topics in indoor air quality have been as misunderstood as houseplants. The origin story is well-known: NASA’s 1989 Clean Air Study demonstrated that certain houseplants could remove formaldehyde, benzene, and trichloroethylene from sealed chambers. The finding went viral — and was widely misinterpreted.

Here’s what the science actually says, per a 2020 review by Cummings and Waring published in the Journal of Exposure Science & Environmental Epidemiology:

• In sealed chambers, potted plants do remove VOCs. This is not in dispute.
• In real buildings, however, the clean air delivery rate (CADR) of a single potted plant is roughly 0.1–1 cubic feet per minute — compared to tens or hundreds of cfm from even modest natural ventilation.
• To match the VOC removal of one open window, you would need between 100 and 1,000 plants per room.

A more recent 2023 systematic review in PMC confirmed that while individual potted plants have limited effect, active green walls (dense vertical plantings with active airflow through the root zone) can reduce total volatile organic compounds by approximately 72.5% in controlled settings.

The bottom line: Thinking of a peace lily as an air purifier is misleading. Thinking of it as one component of a broader IAQ strategy — alongside ventilation and source control — is scientifically honest.

What to Look For: Criteria for Choosing Plants for IAQ

If you’re adding plants to your home with air quality in mind, these criteria help separate meaningful contributors from purely decorative choices:

1. High transpiration rate: Plants that move more water through their leaves also move more air across their leaf surfaces. Boston ferns, areca palms, and peace lilies are known for high transpiration.
2. Broad leaf surface area: More leaf area = more gas exchange. Snake plants (Sansevieria) and spider plants offer substantial surface area relative to their footprint.
3. Documented VOC uptake: The original NASA research — while not applicable at building scale — correctly identified species with measurable phytoremediation capacity. These include peace lily (Spathiphyllum), snake plant (Sansevieria trifasciata), English ivy (Hedera helix), and the parlor palm (Chamaedorea elegans).
4. Low pollen, low mold risk: Overwatering creates mold in potting soil, which introduces a new IAQ problem. Choose plants that tolerate drier conditions between waterings.
5. Manageable size: One 6-foot fiddle-leaf fig contributes more leaf area than twenty 4-inch succulents. Go larger with fewer plants rather than cluttering every surface.

Practical Pathways

• Cluster plants in the rooms you inhabit most: Bedrooms and living areas see the most continuous occupancy. Grouping 4–6 substantial plants in a 200-square-foot room creates a small but real micro-environmental benefit — and research consistently shows psychological benefits regardless of IAQ impact.
• Keep leaves clean: Dust-covered leaves don’t transpire effectively. Wipe broad leaves with a damp cloth monthly.
• Pair plants with ventilation: An open window near a cluster of plants creates airflow across leaf surfaces, maximizing what gas exchange capacity the plants do offer.

Honest framing: If you’re adding plants purely for air quality, the cost-to-benefit ratio is poor compared to ventilation. If you’re adding them because you enjoy plants — and want to steer toward species that contribute something to cleaner indoor air — the criteria above will guide you.

Beyond the Big Three: Additional Source-Control Strategies

While ventilation, safer cleaning, and plants form the backbone of a natural VOC-reduction strategy, several additional practices warrant attention:

Furnish with intention: Solid wood furniture (finished with water-based sealants) off-gasses dramatically fewer VOCs than pressed-wood or composite furniture bound with formaldehyde-based adhesives. When pressed wood is unavoidable, look for California Air Resources Board (CARB) Phase 2 compliant products, which meet the strictest formaldehyde emission standards in the United States.

Air out dry cleaning: Perchloroethylene, the solvent used by roughly 70% of U.S. dry cleaners, is classified as a probable human carcinogen. Remove dry-cleaned clothing from plastic bags immediately and hang outdoors or in a well-ventilated garage for several hours before bringing items into living spaces. Consider switching to cleaners that use liquid carbon dioxide or professional wet cleaning.

Paint strategically: Low-VOC and zero-VOC paints are now widely available and competitively priced. If painting, schedule it for seasons when windows can remain open for 48–72 hours. Never store leftover paint in living spaces — even sealed cans emit VOCs.

Embrace the “smell test” as a rough heuristic: If a product has a strong chemical odor, your olfactory system is detecting VOCs. While not all VOCs have detectable odors and not all odors indicate dangerous VOCs, a strong chemical smell is a reasonable prompt to increase ventilation or reconsider the product.

A Note on Measurement

You cannot manage what you cannot measure. While professional VOC testing runs hundreds of dollars, consumer-grade indoor air quality monitors that measure total VOCs (TVOCs) have improved significantly and typically cost $100–$200. These devices don’t identify specific compounds, but they track trends — revealing whether your interventions are moving VOC levels in the right direction. If levels don’t respond to increased ventilation, that’s useful information: it suggests a persistent source that needs to be identified and addressed.

Practical Solutions: Lower-VOC Cleaning Options

The cleaning products you choose directly affect your indoor VOC burden with every use. Based on the 8 criteria outlined above — no petrochemicals, no VOCs, fragrance-free, plant-derived surfactants, USDA food-area rating, transparent disclosure, and concentrated format — choose a practical option that meets that high standard across the board.

Summary: The 15-Minute VOC Reduction Checklist

If you take nothing else from this guide, here is the minimum viable plan — actions you can complete in a single afternoon:

1. ✅ Open opposing windows for 10 minutes in every occupied room
2. ✅ Check that bathroom and kitchen exhaust fans vent outdoors, not into the attic
3. ✅ Remove all plug-in air fresheners and aerosol room sprays from the space
4. ✅ Move cleaning product storage to a garage, basement utility closet, ventilated closet or ventilated outdoor storage
5. ✅ Unwrap and off-gas any new furniture, rugs or equipment in the garage or outdoors for 7–10 days before bringing inside
6. ✅ Switch to a criteria-verified, low-VOC all-purpose cleaner
7. ✅ Add 2–3 broad-leaf plants to your most occupied rooms (optional but beneficial as part of a layered strategy)
8. ✅ Run the free IAQ Risk Calculator to identify the highest-impact next steps for your specific space

Cleaner indoor air isn’t about perfection. It’s about cumulative, science-informed decisions that compound over time. Start with ventilation — it’s free, it’s immediate, and it works.

Take the Next Step: Assess Your Indoor Air Quality

VOCs are invisible, but their sources aren’t. INDEX’s free IAQ Risk Calculator walks you through 12 questions about your building’s age, ventilation habits, cleaning products, furnishings, and more — then delivers a personalized risk score with actionable recommendations.

This tool, developed around our 501(c)(3) Science-to-Solution methodology, is free and takes under four minutes.

Get Your Free IAQ Risk Score →

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By the INDEX Editorial Team | Last updated: October 2026

Sources: U.S. Environmental Protection Agency (EPA) Indoor Air Quality division; American Lung Association; Cummings & Waring, Journal of Exposure Science & Environmental Epidemiology (2020); Kumar et al., PMC (2023); ASHRAE Standard 62.2; California Air Resources Board (CARB).