Air Pollution & Indoor Air Quality, at Home.
The same global air pollution crisis that affects cities also plays out inside residences. Most people spend the majority of their time at home, sleeping, cooking, relaxing, working, making homes the primary exposure environment for many pollutants, including fine and ultrafine particles.
The global air quality crisis reaches into every home.
Outdoor air pollution contributes significantly to indoor exposures, but in residences, indoor sources, cooking, heating, smoking, candles, cleaning products, and off-gassing materials, often play an even larger role in determining actual inhaled dose. The health impacts, cardiovascular disease, respiratory disease, cancer, and potential neurological effects, are the same as in commercial environments, but the patterns of exposure are shaped by residential behaviors and building characteristics.
Why ultrafine particles matter in the home.
Particulate matter is classified by aerodynamic diameter. Smaller particles reach deeper into the lungs, and the very smallest cross into the bloodstream.
PM10
Coarse particles, dust and larger droplets. Deposit mainly in the upper airways.
PM2.5
Fine particles from combustion and secondary aerosols. Reach the small bronchioles.
PM1 & PM0.1
The smallest, most penetrating particles. Ultrafines (PM0.1) can cross the air–blood barrier and travel throughout the body.
Everyday household sources of fine and ultrafine particles.
Repeated daily exposures in the home may contribute significantly to long-term cardiovascular and respiratory risk. Because ultrafine particles can penetrate deep into the lungs and enter the bloodstream, the source list matters:
- Cooking, frying, grilling, toasting and high-temperature cooking generate large numbers of ultrafine particles
- Gas stoves and ovens, combustion produces NO₂ and ultrafine particles
- Wood stoves and fireplaces, major sources of fine and ultrafine combustion particles
- Candles and incense, emit soot and ultrafine particles
- Smoking or vaping indoors, high particle number concentrations
- Cleaning products and sprays, can generate aerosols and react with ozone to form secondary ultrafine particles
Indoor concentrations can equal, or exceed, outdoor levels.
Residential buildings, like commercial ones, are rarely airtight. Outdoor fine and ultrafine particles infiltrate through cracks and gaps in the building envelope, open windows and doors, and mechanical ventilation systems. Studies show that infiltration factors for ultrafine particles in homes are often greater than 0.5, meaning a substantial fraction of outdoor ultrafines penetrate indoors and remain suspended.
Unlike many commercial buildings, homes also have strong indoor sources. Indoor ultrafine particle concentrations can equal or exceed outdoor levels during and after cooking events. Homes with gas stoves, wood stoves or frequent candle use experience repeated spikes in ultrafine particle number concentrations. In attached garages, vehicle emissions and stored fuels or solvents can introduce additional pollutants into the living space.
Because most homes lack effective ultrafine filtration, these particles can accumulate and persist, especially in poorly ventilated spaces.
What a typical furnace filter actually captures.
Most forced-air residential HVAC systems use 1-inch to 5-inch pleated filters with low to moderate MERV ratings, often MERV 4–8. Some higher-end systems use MERV 11–13.
MERV 4–8
Effective for larger particles, dust, lint, pollen. Provides almost no protection against PM2.5 and PM0.1.
MERV 11–13
Improves PM2.5 mass reduction and helps in the 0.3–1.0 µm range, but remains largely ineffective for PM0.1 (ultrafine).
From a health perspective, especially for families with children, older adults, or individuals with asthma, COPD, or cardiovascular disease, the most harmful fraction of airborne particles is largely unaddressed by conventional residential filtration.
Room devices help, but they don't cover the whole home.
Many households use portable HEPA or HEPA-like devices. Properly sized and operated, they can significantly reduce particle concentrations in a single room, and provide meaningful benefit during high-pollution events such as wildfire smoke or allergen surges. Their limits are practical:
- Typically do not provide whole-home coverage
- Performance depends on placement, airflow and maintenance
- Often not operated continuously or at sufficient fan speed to hold particle levels down
- Best used as part of a whole-home strategy, not a replacement for it
A whole-home approach that integrates central filtration, source control and targeted room cleaning is generally more effective than relying on portable devices alone.
Building codes address heat, moisture and ventilation, not particle size.
There are no residential regulations requiring homeowners to address ultrafine particles. Building codes and energy standards focus on thermal performance, moisture control and ventilation rates. They rarely address particle size, filtration efficiency, or health-based IAQ targets.
Consumer awareness is also limited. Most homeowners are familiar with "dust" and "allergens," but not with PM2.5 or PM0.1. Many assume that any "furnace filter" or "HEPA" label implies comprehensive protection, even when ultrafine particles are not effectively captured.
Four ultrafine sources drawing rapid scientific attention.
Beyond the everyday cooking, heating and outdoor-infiltration sources, four ultrafine sources reach homes just as readily as commercial buildings, and each concentrates mass in a range that ordinary residential filters, even at MERV 11–13, were never engineered to capture.
Wildfire smoke
North American wildfire activity has grown sharply with climate change, and smoke now travels thousands of kilometers, affecting homes far from any active fire. A 2026 study of the January 2025 Los Angeles fires found ultrafine particles (<100 nm) carried high concentrations of toxic metals, PFAS and carcinogenic compounds, because urban wildfires burn cars, batteries and building materials, not just trees. These particles infiltrate homes through the same gaps and ventilation pathways as everyday outdoor pollution, and ordinary furnace filters were not designed to capture them.
Traffic-related non-exhaust emissions
As tailpipe pollution controls have improved, brake and tire wear, not exhaust, are now the dominant traffic-related particulate source in many areas, producing black carbon and metal-laden ultrafine particles with a peak size below 100 nm. Homes near busy roads draw these particles indoors continuously. The EU's new Euro 7 standard is the first regulation anywhere to set limits on this source, an early sign of where attention is heading.
Airborne micro & nano plastics
Plastic particles are now found in human blood, lung tissue, and, per a 2025 Nature Medicine study, in brain tissue at sharply rising concentrations between 2016 and 2024. The home is a major contributor: indoor airborne microplastic levels run roughly eight times higher than outdoors, shed continuously by carpets, upholstery, synthetic textiles and even HVAC components. This source sits entirely outside conventional filter testing standards.
Radon decay products (RDP)
Radon gas passes through any filter untouched, but its radioactive decay products attach to household dust and airborne particulates. That attached particulate is what actually deposits in the lungs, contributing to an estimated 21,000 U.S. lung cancer deaths annually, more than any indoor air hazard except smoking. Radon is especially relevant in basements and lower floors, which describes a large share of Canadian and northern U.S. housing stock. Filtration capturing the ultrafine particulates RDP attaches to is a meaningful complement to, not a substitute for, sub-slab radon mitigation.
What the emerging science says about home filtration.
For residential applications, the emerging science on ultrafine particles points to a layered strategy, and to filtration that is purpose-built for PM0.1.
- Source control is essential, use exhaust hoods that vent outdoors when cooking; avoid or minimize indoor smoking and frequent candle burning; maintain combustion appliances and consider electric alternatives where feasible
- Ventilation and pressure balance matter, adequate ventilation dilutes indoor pollutants but can also introduce outdoor particles, making filtration critical
- Filtration must address ultrafine particles, conventional 1-inch to 5-inch filters, even at higher MERV ratings, provide limited protection against PM0.1
- Advanced filtration, technologies such as Electronic Polarization Filtration (EPF) that capture ultrafine particles at low pressure drop, and integrate into existing residential HVAC systems, represent a significant step forward for health-based IAQ
What we typically spec for residential homes
Each of these is built around the same patented EPF core, they differ in cabinet depth, MERV target and pad geometry.
- Dynamo™ 1″ E.A.C.
- Replacement Pads
- Cabinet Conversion Kit
Send us the building. We'll send back the unit.
One business-day reply, engineering review included.