Americans spend about 90 percent of their time indoors, according to the EPA. That single statistic changes how you should think about indoor air quality — which, for most people, is not something they think about much at all.
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) are gases emitted by a wide range of household products: paint, cleaning supplies, furnishings, flooring adhesives, air fresheners, and personal care products. 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 renovated homes.
Mold and mold spores are a significant concern in northeast Tennessee's warm, humid climate. Mold spores circulate through HVAC systems and settle throughout the home. For people with allergies or asthma, mold exposure is a common trigger.
Bacteria and viruses circulate in enclosed spaces with limited ventilation. Standard HVAC filtration captures some particulate matter but is not designed to neutralize biological contaminants.
Pet dander and fine particulate matter round out the list of the most common indoor air concerns, particularly in homes with older construction or limited ventilation.
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 on surfaces, in corners, or that 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 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.
ActivePure has been cleared by the FDA as a Class II Medical Device, the same category as many hospital-grade purification systems. A 2025 study showed the technology inactivating over 99 percent of aerosolized respiratory viruses within minutes. The system integrates with existing HVAC ductwork and does not generate ozone as a byproduct — an important distinction, since 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, where dander and odors are persistent challenges that standard filtration addresses only partially.
Allergy and asthma sufferers, for whom mold spores, pet dander, and VOCs are common triggers.
Older homes, which often have more sources of VOC off-gassing, less consistent ventilation, and more potential for mold in crawl spaces and basements.
New construction, counter-intuitively, where tight building and new materials can create high VOC levels during the first months after construction.
The Connection to Water Quality
Mold growth and air quality problems often start with water problems. Plumbing leaks, high humidity in bathrooms, basement moisture — these create the conditions mold needs. Addressing water quality and air quality together gives a more complete picture of your home's environment.
At Mountain View Pure Water and Air, we test water and offer air purification solutions because those two things are related. 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.
Reach us at https://mvpwater.net or call 423-218-9361 to schedule.
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