The phrase “indoor air quality test” gets used broadly, and that creates confusion about what testing actually involves and what it tells you. Someone whose tenant is complaining of respiratory irritation, someone who just finished a basement renovation, and someone who recently moved into a new home all might be told they need an indoor air quality test, but those three situations call for testing very different things.
Indoor air quality is not a single measurement. It is a category that includes dozens of possible contaminants, each with its own measurement method, its own health implications, and its own set of sources. A comprehensive IAQ assessment addresses several of these. A targeted test focuses on one or two specific concerns. Knowing which one you need starts with understanding what is actually being measured.
Mold and Biological Contaminants
The most common reason people request indoor air quality testing in the Augusta area is concern about mold. Mold testing is its own discipline, typically involving spore trap air sampling, surface swabs, or tape lift sampling, followed by laboratory analysis that identifies and counts the mold types present.
The relevant comparison in mold air testing is between indoor spore concentrations and outdoor baseline levels. Some mold spores are always present in the air; they are part of the natural environment. The question is whether the types and concentrations inside the home are elevated above what would be expected from simply opening a window and letting outdoor air in. If indoor air has significantly higher concentrations of certain mold genera, or if unusual species that are uncommon outdoors are found indoors at elevated levels, that suggests an indoor mold source.
Mold testing does not replace a visual inspection. The combination of a thorough physical inspection and air or surface sampling gives the most complete picture of whether there is an active mold problem and where it is concentrated.
Volatile Organic Compounds (VOCs)
VOCs, or volatile organic compounds, are chemicals that vaporize at room temperature and become part of the air you breathe. The category is broad: it includes solvents, adhesives, cleaning products, paints, pressed wood products, carpeting, and some materials used in furniture and cabinetry.
Common VOCs found in indoor environments include formaldehyde, benzene, toluene, xylene, and a range of others that vary by the materials present in the space. The EPA’s guidance on VOCs notes that concentrations of many VOCs are consistently higher indoors than outdoors, often by a factor of two to five, and up to ten times higher if the space has poor ventilation or new synthetic materials off-gassing.
Formaldehyde is one of the most frequently tested-for VOCs because it is present in a wide range of common building materials: particleboard subflooring, laminate flooring, cabinet boxes, furniture, and some insulation products. Short-term exposure to elevated formaldehyde causes eye, nose, and throat irritation. Long-term exposure at higher concentrations is associated with cancer risk.
VOC testing involves collecting air samples with specialized sampling media, then sending them to a laboratory for analysis by gas chromatography. Results tell you which VOCs are present and at what concentrations, compared to reference levels established by agencies like the EPA and NIOSH (National Institute for Occupational Safety and Health).
Carbon Dioxide and Ventilation Adequacy
Carbon dioxide (CO2) is a straightforward indicator of whether a space is adequately ventilated. People exhale CO2, and in a poorly ventilated space, CO2 concentrations rise. Outdoor air is approximately 400 to 450 parts per million (ppm) CO2. Indoor spaces with adequate ventilation typically stay below 1,000 ppm. Above 1,000 ppm, occupants often report stuffiness, fatigue, and reduced concentration. Above 2,000 ppm, cognitive effects become measurable.
For offices, classrooms, and occupied commercial spaces, CO2 monitoring is one of the most useful proxies for overall ventilation performance. A CO2 reading above 1,000 ppm during occupied hours does not mean there is a specific pollutant problem; it means the ventilation system is not exchanging air adequately, which allows whatever pollutants are present to accumulate.
CO2 testing is relatively simple and inexpensive. A handheld or fixed monitor can provide real-time readings across a building. It is often the first diagnostic tool used when occupant complaints in an office building suggest poor air quality without a specific suspected cause.
Particulate Matter
Particulate matter (PM) refers to tiny solid or liquid particles suspended in the air. PM2.5 refers to particles smaller than 2.5 micrometers, small enough to penetrate deep into the lungs. PM10 includes somewhat larger particles that deposit in the upper respiratory tract.
Sources of indoor particulate matter include cooking, candles, incense, tobacco or cannabis smoke, wood-burning fireplaces, and resuspension of particles from floors and surfaces by movement. High indoor PM2.5 concentrations are associated with respiratory irritation, worsened asthma and COPD symptoms, and cardiovascular effects with long-term exposure.
The EPA’s Air Quality Index is typically used for outdoor air, but similar standards can be applied to assess indoor concentrations. Particulate monitoring is useful in homes where occupants have respiratory conditions, in offices where printers or manufacturing equipment may be generating particles, and in any space where smoking or burning of materials occurs.
Carbon Monoxide
Carbon monoxide (CO) is a colorless, odorless gas produced by incomplete combustion of fuels. It is distinct from carbon dioxide. Gas appliances, furnaces, water heaters, generators, and attached garages are all potential CO sources in homes and commercial buildings.
CO is acutely toxic at elevated concentrations and subtly harmful at moderate levels. Low-level chronic CO exposure causes symptoms that mimic flu or fatigue and is often unrecognized. This makes CO detectors essential in any occupied building with combustion appliances.
CO testing as part of an IAQ assessment typically involves measuring concentrations in areas near combustion appliances during operation. If a furnace or water heater is backdrafting, sending combustion gases back into living space instead of out the flue, CO levels in adjacent areas will be elevated.
Radon
Radon is technically an indoor air quality issue, though it is typically tested separately from other IAQ parameters because it requires dedicated sampling equipment and has its own regulatory framework. Radon testing is covered in detail separately, but it is worth noting that a complete picture of indoor air quality in an Augusta home should include radon testing if it has not been done recently.
When to Consider IAQ Testing
The situations that most frequently warrant indoor air quality testing include:
New construction or major renovation. New materials off-gas VOCs. Renovations disturb building materials, introduce new products, and can disrupt existing HVAC configurations. Testing after major work establishes a baseline and identifies any problems before the space is occupied long-term.
Persistent occupant complaints. When building occupants consistently report headaches, eye irritation, respiratory symptoms, or fatigue that improves when they leave the building, IAQ testing gives you data to act on rather than speculation about the cause.
Visible moisture damage or suspected mold. If there has been water intrusion, flooding, or visible mold, testing after remediation confirms whether the problem was resolved or whether residual contamination remains.
Purchase of a pre-existing home or commercial space. Understanding the air quality in a space you are about to commit to long-term occupancy gives you information that a standard home inspection does not provide.
Vulnerable occupants. If anyone in the home or building has asthma, COPD, cancer treatment-related immune suppression, or is very young or very old, understanding the indoor air environment is more consequential than it would be in a building of healthy adults.
If you have questions about what kind of testing makes sense for your home or facility in the Augusta area, the EnviroPro 360 team is glad to talk through your specific situation. Reach out any time.
