The Other Half of Home Health — What's in the Air You're Breathing

Americans spend about 90 percent of their time indoors, according to the EPA . That single statistic changes the way you should think about indoor air quality, which is currently not the way most people think about it.

Outdoor air quality has visible measurement tools — AQI readings, smog alerts, air quality advisories. Indoor air gets almost no similar attention, even though the EPA has consistently found that indoor air can be two to five times more polluted than outdoor air in most cities. The sources are different, the exposure time is vastly longer, and the options for addressing it are not well understood by most homeowners.

If your family spends most of its life inside your home, what you are breathing matters.

What Is Actually in Indoor Air

The contaminants in indoor air fall into several categories, and they come from sources most homeowners would not immediately identify.

Volatile organic compounds (VOCs). These are gases emitted by a wide range of household products: paint, cleaning supplies, furnishings, flooring adhesives, air fresheners, and personal care products. Common VOCs include benzene, formaldehyde, and toluene. Many are irritants; some are known or suspected carcinogens at elevated concentrations. Off-gassing from new furniture, carpet, and cabinetry can be particularly high in newly built or recently renovated homes.

Mold and mold spores. Northeast Tennessee's climate — warm, humid summers with significant rainfall — creates favorable conditions for mold growth in basements, crawl spaces, bathrooms, and anywhere with moisture intrusion. Mold spores circulate through HVAC systems and settle throughout the home. For people with allergies or asthma, mold exposure is a significant trigger. For some immune-compromised individuals, certain mold species pose more serious health risks.

Bacteria and viruses.  Airborne pathogens circulate in enclosed spaces with limited ventilation. Standard HVAC filtration captures some particulate matter but is not designed for microbial inactivation — a HEPA filter traps, but does not neutralize, biological contaminants.

Pet dander and allergens.  Among the most common indoor air quality complaints. Standard filtration helps with airborne particulates but does not address dander that has settled on surfaces.

Particulates matter.  Fine particles from cooking, candles, and outdoor infiltration accumulate in homes with limited ventilation. PM2.5, the fine particulate size linked to cardiovascular and respiratory health effects, is not effectively addressed by most standard HVAC filters.

Passive vs. Active Purification

Most homeowners who have thought about air quality have thought about filters. Filters are passive — they capture what passes through them. They do not address pollutants that are on surfaces, in corners, or that have settled out of the air before reaching the filter.

There is a second category of air purification that works differently: active systems that send purifying molecules into the environment to neutralize contaminants where they are, rather than waiting for them to pass through a filter.

ActivePure technology, the air purification line carried by Mountain View Pure Water and Air through Aerus, operates on this principle. It uses a photocatalytic process — advanced photocatalysis — that replicates the cleansing mechanism sunlight uses outdoors: generating hydrogen- and oxygen-based molecules that actively seek out and break down bacteria, viruses, mold spores, and VOC gases at the molecular level. The result is purification that happens in the air and on surfaces throughout the space.

ActivePure has been cleared by the FDA as a Class II Medical Device — the same category as many hospital-grade purification systems. Independent laboratory testing has validated its effectiveness against a range of pathogens, including MRSA and drug-resistant organisms. A 2025 study showed the technology inactivating over 99 percent of aerosolized respiratory viruses, including SARS-CoV-2 and RSV, within minutes.

The system integrates with existing HVAC infrastructure — installed in the ductwork, it treats air throughout the home continuously without replacement cartridges or significant maintenance. Unlike some photocatalytic oxidation (PCO) technologies, ActivePure does not generate ozone as a byproduct, which is an important distinction given that ozone itself is a respiratory irritant.

Who Benefits Most

Not every home needs active air purification. But certain households notice a more significant difference:

Homes with pets. Pet dander and odors are persistent challenges that standard filtration addresses only partially. Active purification systems that work on surfaces as well as airborne particles address the full exposure pathway.

Allergy and asthma sufferers. Mold spores, pet dander, and VOCs are common triggers. Active purification reduces the concentration of these in the air and on surfaces continuously, not just when the HVAC system is running.

Older homes. Older construction often has more sources of VOC off-gassing (older finishes, materials), less consistent ventilation, and more potential for mold in crawl spaces and basements. Active purification compensates for what the structure's ventilation cannot accomplish on its own.

New construction.  Counter-intuitively, new homes often have the highest VOC levels due to off-gassing from new materials — adhesives, paints, carpet, cabinetry. Tight construction also means less natural ventilation. An active purification system addresses the high-VOC period during the first months after construction.

Homes where someone has respiratory concerns.  Asthma, COPD, compromised immunity — any condition that makes air quality a higher-stakes issue for someone in the household makes active purification more relevant.

The Connection to Water Quality

Mold growth and air quality problems often start with water problems. Plumbing leaks, high humidity from hard water vapor in bathrooms, basement moisture from inadequate drainage — these create the conditions mold needs. Addressing water quality and air quality together gives a more complete picture of what your home's environment is actually like for the people living in it.

At Mountain View Pure Water and Air, we test water and offer air purification solutions because those two things are related. What you drink and breathe both matter. A home that has clean water and clean air is a fundamentally different environment than one that does not.

If you are interested in air quality for your home, the conversation starts the same way the water conversation does: with a look at what is actually in your space. An air quality consultation with our team covers what you are dealing with and what makes sense to address it.

Reach us at mvpwater.net or call 423-218-9361 to schedule.