Here’s an example scenario: a family in Evans moves into a newly built home and within the first week, two household members develop persistent headaches and one child starts complaining about a sore throat that doesn’t go away. They check for mold: nothing. Radon test: normal. They assume it’s seasonal allergies. Two months later, after the symptoms don’t improve, they get an indoor air quality test. The results show formaldehyde levels three times higher than the EPA’s reference concentration and elevated total VOC levels traced to new cabinetry, flooring adhesive, and interior paint.
Mold and radon get most of the attention in indoor air quality conversations, but they’re not the only pollutants worth knowing about. Volatile organic compounds, particulate matter, and formaldehyde are present in virtually every home, and their sources are things most people bring inside on purpose.
Volatile Organic Compounds (VOCs)
VOCs are organic chemicals that evaporate at room temperature, releasing gases into the air. The term covers a broad category of compounds, some relatively harmless, others with well-documented health effects.
Where They Come From
The EPA identifies thousands of products that emit VOCs. In a typical home, the most significant sources include:
- Paints and finishes: Fresh paint off-gasses for days to weeks. Even “low-VOC” paints emit some compounds during and after application.
- New furniture and cabinetry: Pressed wood products (particleboard, MDF, plywood) use urea-formaldehyde resins that emit formaldehyde and other VOCs for months or years.
- Flooring: New carpet, vinyl flooring, laminate, and the adhesives used to install them are significant VOC sources.
- Cleaning products: Many household cleaners, disinfectants, and air fresheners contain VOCs. The fragrance compounds in these products are VOCs by definition.
- Personal care products: Hair spray, nail polish, perfume, and aerosol products all release VOCs.
- Stored chemicals: Gasoline, paint thinner, pesticides, and solvents stored in attached garages can off-gas into the home.
Health Effects
Short-term exposure to elevated VOCs can cause eye, nose, and throat irritation, headaches, dizziness, and nausea. Long-term exposure to certain VOCs (benzene, formaldehyde, perchloroethylene) is associated with increased cancer risk. The specific health effects depend on the compound, concentration, and duration of exposure.
The EPA notes that indoor VOC levels are consistently two to five times higher than outdoor levels, and up to ten times higher during and immediately after activities like painting or furniture assembly.
Formaldehyde
Formaldehyde deserves special attention because of its prevalence and its health effects. It’s a colorless gas with a sharp odor at high concentrations, but it’s often present at levels too low to smell.
Primary Sources
Pressed wood products are the largest source in most homes. Particleboard, MDF (medium-density fiberboard), and hardwood plywood use urea-formaldehyde (UF) resins as binding agents. Cabinets, shelving, subflooring, furniture, and decorative paneling made from these materials emit formaldehyde continuously, with emission rates highest when the products are new and declining over months to years.
The CDC’s Agency for Toxic Substances and Disease Registry identifies formaldehyde as a known human carcinogen based on sufficient evidence of nasopharyngeal cancer in humans with high or prolonged exposure.
Other sources include combustion appliances (gas stoves, unvented heaters), tobacco smoke, certain insulation products, and some fabric treatments.
Health Effects
At concentrations above 0.1 ppm (parts per million), formaldehyde causes irritation of the eyes, nose, and throat. Sensitive individuals may react at lower concentrations. Chronic exposure is associated with increased risk of nasopharyngeal cancer and possibly leukemia. Children and individuals with asthma or chemical sensitivities are more susceptible.
Particulate Matter
Particulate matter (PM) refers to microscopic solid or liquid particles suspended in air. Two size categories are most relevant to health:
PM10 (particles 10 micrometers or smaller) can be inhaled into the respiratory tract, causing irritation and aggravating existing respiratory conditions.
PM2.5 (particles 2.5 micrometers or smaller) are fine enough to penetrate deep into the lungs and cross into the bloodstream. The EPA classifies PM2.5 as a serious health concern, with both short-term and long-term exposure linked to respiratory disease, cardiovascular problems, and premature death.
Indoor Sources
- Cooking: Frying, broiling, and toasting generate significant PM2.5. Gas stoves also produce combustion particulates.
- Candles and incense: Burning candles and incense are major indoor PM sources.
- Fireplaces and wood stoves: Even with proper venting, these can release particles into the home.
- Tobacco smoke: One of the most significant indoor PM sources.
- Outdoor infiltration: PM from vehicle exhaust, pollen, and wildfire smoke enters through windows, doors, and HVAC systems.
- HVAC systems: Ductwork that hasn’t been cleaned accumulates dust, mold, and debris that recirculates with every air cycle.
- Renovation activities: Sanding, cutting, and demolition generate enormous amounts of particulates.
How Indoor Air Quality Testing Works
Professional IAQ testing uses calibrated instruments and laboratory analysis to measure specific pollutants:
VOC testing typically involves collecting air samples using sorbent tubes or evacuated canisters. The laboratory identifies individual compounds and reports concentrations. Total VOC (TVOC) readings from real-time instruments provide a quick screening, but laboratory analysis is needed to identify specific compounds.
Formaldehyde testing uses dedicated sampling badges or active air sampling. Results are compared to reference levels such as the EPA’s reference concentration of 0.008 ppm for chronic exposure or California’s more stringent guideline of 0.007 ppm.
Particulate monitoring uses real-time instruments that measure PM2.5 and PM10 concentrations continuously. This captures both baseline levels and peak events (cooking, cleaning, etc.).
Results are compared to EPA reference concentrations, OSHA permissible exposure limits (for workplace environments), and ASHRAE guidelines for acceptable indoor air quality.
Reducing Your Exposure
You don’t need to test before taking basic steps to improve your indoor air quality.
Source Control
- Choose low-VOC or zero-VOC paints and finishes when possible.
- When buying pressed wood furniture or cabinetry, look for products labeled CARB Phase 2 compliant or made with no-added-formaldehyde (NAF) resins.
- Allow new furniture and building materials to off-gas in a garage or ventilated space before bringing them into occupied rooms.
- Switch to unscented or naturally derived cleaning products.
Ventilation
- Run exhaust fans while cooking and for 15 minutes after.
- Open windows when weather permits, especially after painting, installing new flooring, or bringing in new furniture.
- Make sure your HVAC system’s outdoor air intake is functioning properly.
Filtration
- Use HVAC filters rated MERV 11 or higher to capture fine particulates.
- Consider a standalone HEPA air purifier in bedrooms or main living areas if particulate levels are a concern.
What to Do
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If you’re experiencing unexplained symptoms (headaches, irritation, respiratory discomfort) that correlate with time spent in a specific building, consider professional IAQ testing to identify what you’re breathing.
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If you’ve recently built, renovated, or installed new materials, ventilate aggressively for the first several weeks and monitor how occupants feel.
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Maintain your HVAC system. Change filters on schedule, keep condensate drains clear, and consider duct cleaning if the system hasn’t been serviced in years.
If you want to know what’s in your indoor air, the EnviroPro 360 team can test for VOCs, formaldehyde, particulates, and other pollutants and give you specific, actionable results. Reach out here and we’ll help you breathe easier.
