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A Homeowner’s Guide to Cleaner Air from Dor-Mar Plumbing, Heating & AC
The air inside your home shapes your family’s comfort, health, and daily energy levels far more than most people realize. For homeowners across Central Ohio and Southwest Florida, understanding indoor air quality is one of the most practical investments you can make. This guide breaks down the pollutants lurking in your home, how they get there, what they do to your body, and exactly what you can do about them-with help from Dor-Mar’s six decades of HVAC expertise.
Key Takeaways
Americans spend approximately 90% of their time indoors, and the air inside homes is frequently more polluted than the air outside. For residents of Central Ohio and Southwest Florida-where homes are sealed tight against cold winters, scorching summers, and relentless humidity-indoor air quality deserves serious attention.
- Common indoor pollutants like mold, dust mites, animal dander, volatile organic compounds, carbon monoxide, and radon gas can cause headaches, allergies, breathing issues, and long-term disease including lung cancer and heart disease.
- The Environmental Protection Agency recommends three core strategies: source control, proper ventilation, and effective air cleaners and filtration.
- Poor indoor air quality affects everyone but hits hardest for children, older adults, people with asthma or COPD, and anyone spending extended time indoors for work or retirement.
- Dor-Mar offers indoor air quality inspections, HVAC maintenance, whole-home filtration, humidity control solutions, radon mitigation, and carbon monoxide safety checks for homes and light commercial spaces in Central Ohio and Southwest Florida.
- Schedule an IAQ assessment or join Dor-Mar’s Home Comfort Membership for ongoing protection, priority service, and regular safety checks year-round.
Indoor Air Quality Concerns in Today’s Homes
Indoor Air Quality (IAQ) refers to air quality within and around buildings, including the concentration of particulates, gases, biological matter, and chemical pollutants in the air you breathe indoors. It also encompasses how those pollutants interact with your ventilation system, humidity levels, temperature, and filtration to affect comfort and health.
Why does indoor air quality matter more now than when many Ohio and Florida homes were originally built? Several factors contribute to that shift. First, modern construction and energy-efficiency upgrades have made homes significantly tighter. Double-pane windows, spray-foam insulation, and aggressive air sealing keep conditioned air in and utility bills down-but they also reduce the natural air exchange that once diluted indoor pollutants. Second, the materials inside our homes have changed. Synthetic flooring, pressed-wood cabinets, chemical cleaning products, and building materials used in today’s construction all release compounds into the indoor environment. Third, since the early 2020s, more people are working from home, spending even more time indoors and increasing their cumulative exposure.
Indoor air can be up to 5 times more polluted than outdoor air. The EPA estimates that concentrations of many pollutants indoors are two to five times higher than typical outdoor levels, and during events like painting or heavy cleaning, levels can spike dramatically higher. When you consider that most people spend roughly 90% of their time indoors-in homes, offices, schools, and vehicles-the scale of the exposure becomes clear.
Vulnerable populations are more heavily impacted by poor IAQ. Children whose lungs are still developing, older adults with diminished respiratory reserve, people with asthma, COPD, or cardiovascular disease, and pregnant individuals face elevated risks. Work-from-home professionals and retirees who rarely leave the house accumulate the highest daily exposure.
Consider a typical home in Columbus or Gahanna: a 1970s ranch with a full basement, gas furnace, and recently upgraded windows. That home likely deals with radon seeping through the foundation, moisture condensing in the basement during temperature swings, and spring pollen infiltrating through aging ductwork. Compare that to a condo in Cape Coral or Fort Myers where the AC runs ten months a year, outdoor humidity hovers between 60% and 80%, and mold growth behind drywall is an ever-present concern, challenges that mirror what Naples, Florida homeowners face with their HVAC systems. Both scenarios demand attention to indoor air.
Why a Practical Indoor Air Quality Guide for Homeowners?
Multiple everyday activities-cooking on a gas stove, mopping with chemical cleaners, unpacking new furniture, spraying air freshener-add up to poor indoor air quality without homeowners ever realizing it. No single source may seem alarming, but the cumulative effect in a sealed-up home can be significant.
Federal agencies like the Environmental Protection Agency and the Consumer Product Safety Commission publish detailed indoor air quality guidelines covering pollutant types, exposure limits, and recommended actions. But those guidelines are written broadly. Homeowners in Central Ohio and Southwest Florida need a local contractor like Dor-Mar to translate that guidance into real solutions-properly sized systems, correctly installed equipment, and maintenance schedules that account for regional climate.
Many residents also spend hours in offices and schools where mechanical ventilation systems can either dilute or concentrate air pollutants depending on how well they’re maintained. The same principles apply: source control, ventilation, and filtration matter everywhere you spend time indoors.
This guide focuses on practical steps: how pollutants get into your home, what common indoor pollutants to watch for, and how Dor-Mar can help reduce indoor air pollution in homes and small commercial buildings. Later sections cover specific threats like radon, carbon monoxide, and biological contaminants, plus testing methods, remediation options, and when to call a professional.
What Causes Indoor Air Problems?
Indoor air problems develop when multiple factors contribute and pollutant sources outpace ventilation and filtration. In a well-ventilated older home, many of these sources posed less risk because fresh air constantly washed through. In today’s tighter homes, inadequate ventilation can trap pollutants inside modern buildings and allow concentrations to climb.
Key source categories include:
- Combustion: Gas furnaces, gas stoves, fireplaces, wood-burning stoves, attached garages where vehicles idle, and unvented space heaters.
- Building materials: Pressed-wood products, insulation, adhesives, new flooring, and paints that off-gas volatile organic compounds and formaldehyde.
- Household products: Common sources of indoor air pollution include cleaning supplies and cooking, along with air fresheners, pesticides, aerosol sprays, and hobby chemicals.
- Biological sources: Mold, dust mites, bacteria, pet dander, cockroach debris, and pollen tracked in from outdoors.
Poor ventilation-especially in tightly weatherized or newer homes-allows carbon dioxide indoors and other air pollutants to accumulate, making rooms feel stuffy and heavy. Carbon dioxide levels above 1,000 ppm often signal that not enough fresh air is getting in.
Outdoor air pollution also plays a role. Vehicle exhaust, wildfire smoke, ozone, and seasonal pollen can affect indoor air quality after entering through foundation cracks, open windows, and poorly filtered HVAC systems. Ohio’s spring pollen season and Florida’s periodic wildfire haze are prime examples of outdoor pollutants pushing indoor levels higher.
Pollutant levels inside your home depend heavily on how often the HVAC system runs, how well your equipment is maintained, and whether air filters and air cleaners are properly sized and serviced.
How Outdoor Air Enters Your Home
Understanding how outdoor air gets inside helps you decide when to open windows, when to rely on mechanical ventilation, and how to balance energy costs against fresh air needs.
Infiltration is the unintentional flow of air through cracks in foundations, gaps around windows and doors, and openings for plumbing and electrical lines. This is especially common in older Central Ohio homes built before the 1980s, where natural leakage was simply part of the construction. While infiltration dilutes some indoor pollutants, it also lets in pollen, dust, and humidity.
Natural ventilation means intentionally opening windows and doors. Temperature differences and wind drive this airflow, flushing stale air out and bringing fresh air in. The catch: on high-pollen days, during poor outdoor air quality events, or when humidity is extreme, opening windows can make things worse.
Mechanical ventilation involves exhaust fans in kitchens and bathrooms, whole-house fans, and the fresh-air intake components of modern HVAC systems. Proper ventilation reduces indoor pollutant levels significantly, and mechanical ventilation systems can improve indoor air quality in homes that are too tight for adequate natural air exchange. The EPA recommends a ventilation rate of 0.35 air changes per hour (ACH) for new homes-a threshold many modern houses won’t reach without mechanical help.
The concept of air exchange rate is straightforward: it describes how many times per hour the entire volume of air in your home is replaced. If that number is too low, pollutants build up. If it’s too high, your heating and cooling systems work overtime. Finding the right balance is where an experienced HVAC contractor earns their value.
What If You Live in an Apartment, Condo, or Townhome?
Indoor air quality concerns apply to apartments, condos, and townhomes just as much as single-family homes-but tenants and owners in multi-unit buildings have less control over shared systems.
Shared walls, shared ventilation systems, and common areas can allow secondhand tobacco smoke, cooking odors, and other air pollutants to migrate between units. If a neighbor uses heavy-duty cleaning products or smokes indoors, those chemical pollutants and particles can drift into your living space through gaps in walls, shared ductwork, or hallway return air.
Poorly placed outdoor air intakes, inadequate HVAC maintenance by building management, and contaminated air ducts in multi-unit buildings can create building-wide problems. High concentrations of pollutants circulating through a shared ventilation system can lead to sick building syndrome, where multiple building occupants report symptoms like headaches, fatigue, and respiratory irritation.
Practical steps residents can take:
- Control sources within your own unit (avoid smoking indoors, choose low-VOC cleaning products, manage moisture)
- Use portable air cleaners with HEPA filters in bedrooms and main living areas
- Notify building management in writing about ventilation concerns, visible mold, or persistent odors
- Document issues and any health symptoms that improve when you leave the building
While Dor-Mar primarily serves residential homeowners and light commercial properties in its Central Ohio and Southwest Florida service areas, many of the same solutions-filtration upgrades, humidity control, exhaust improvements-apply to smaller multi-unit buildings in their service area.
Indoor Air and Your Health
The health effects of indoor air pollution fall into two broad categories: short-term (acute) reactions and long-term (chronic) conditions, because many indoor pollutants are potential health hazards. Both can be serious, and both are preventable with the right approach.
Immediate symptoms of poor IAQ include irritation of the eyes, nose, and throat. Headaches, dizziness, fatigue, coughing, and shortness of breath are also common, particularly when spending extended time indoors in spaces with elevated pollutant levels. Allergy and asthma flare-ups frequently intensify indoors, driven by dust mites, pet dander, mold spores, and chemical irritants.
Long-term indoor pollutant exposure can lead to heart disease and cancer. Prolonged exposure to radon increases lung cancer risk. Chronic inhalation of fine particulate matter is linked to cardiovascular events. Years of breathing elevated VOC levels, formaldehyde, or combustion byproducts can damage lung function, worsen chronic asthma in children, and contribute to respiratory disease. Poor indoor air can cause respiratory issues and asthma even in people who had no prior diagnosis.
Sensitivity varies significantly within a household. One family member may experience persistent headaches while another feels fine. A strong clue that indoor air quality is a problem: symptoms improve noticeably when you leave the home or office and return when you come back.
Organizations focused on disease control and public health-including the Centers for Disease Control and the American Lung Association-track associations between indoor air pollution and emergency room visits for asthma attacks and cardiac events. Poor IAQ can cause respiratory diseases and chronic health issues that accumulate over years, making early identification and intervention important. The world health organization has also highlighted the global burden of indoor air pollution on human health, particularly in populations with limited ventilation.
Identifying Indoor Air Quality Problems in Your Home
Many indoor air quality issues are discovered only after a move, a renovation, a new appliance installation, or a change in health symptoms among family members. The problem is that most indoor pollutants are invisible.
Start by looking for patterns:
- Symptoms that appear or worsen at home and improve when you’re away
- Issues that begin after carpet replacement, painting, applying pesticides, or installing new cabinets
- Symptoms that spike when the furnace or AC turns on, suggesting contaminated ductwork or a dirty filter
Visible and sensory warning signs include:
- Condensation on windows (especially in Ohio winters)
- Musty odors in basements, closets, or bathrooms
- Visible mold or mildew on walls, ceilings, or around plumbing
- Persistent dust despite regular cleaning
- Dirty or discolored supply vents
- Stuffy, stale-feeling air in certain rooms
Inspect your mechanical systems regularly. Clogged or overly dirty furnace filters, rusted or sooty burners, water pooling around air handlers, and neglected condensate drains-common in Ohio basements and Florida garages-are all red flags.
If multiple family members are experiencing unexplained fatigue, headaches, or breathing trouble, it may be time to schedule a professional indoor air quality assessment with Dor-Mar.
Measuring Pollutant Levels and Testing Your Indoor Air
Not every pollutant requires formal testing, but certain issues-especially radon, carbon monoxide, and severe moisture problems-should be measured to understand your actual risk level.
Radon testing is a must-do in Central Ohio. Widely available, inexpensive EPA-approved test kits can be placed in the lowest livable level of your home (typically the basement in Ohio, or the main floor in slab-on-grade Florida homes). The EPA recommends testing for radon every two years, and always after major structural renovations. Professional radon testing services through Dor-Mar provide more precise results and expert guidance on next steps.
Testing for other pollutants-mold spores, VOCs, or formaldehyde-may be recommended when there are strong persistent odors, visible mold, recent water damage, or symptoms that don’t resolve with basic source control. Comprehensive indoor air testing can be costly, so consult your local health department or a reputable professional before investing in broad test panels.
Continuous monitoring devices have become more accessible. Products like the Airthings View Plus monitor PM2.5, VOCs, CO2, and radon, giving homeowners ongoing visibility into trends. Continuous monitoring helps detect changes in air quality promptly-for example, catching a humidity spike after a plumbing leak or rising carbon dioxide levels that signal poor ventilation. These consumer devices are useful awareness tools but do not replace professional diagnostics for serious problems.
Weatherization, Energy Efficiency, and Air Quality
Weatherization and energy-efficient upgrades-increasingly common since the 2010s in both Ohio and Florida-reduce energy bills but can unintentionally trap indoor pollutants if ventilation is not addressed at the same time, and these changes can also affect indoor air quality when a tighter home is not balanced with proper fresh-air exchange.
Common weatherization steps include sealing cracks, adding insulation, and upgrading windows. Each of these reduces natural air leakage that previously diluted indoor air pollutants. The result: a home that holds temperature well but may also hold onto carbon dioxide, VOCs, moisture, and combustion byproducts. Excess moisture can trap airborne contaminants indoors and accelerate mold growth in wall cavities and around window frames.
Warning signs that energy-efficiency work has gone too far without adequate ventilation:
- New or worsening condensation on windows and cold surfaces
- Musty smells that weren’t present before the upgrade
- Mold growth on window sills, in closets, or behind furniture pushed against exterior walls
- Stale, stuffy rooms despite the HVAC running normally
The solution is not to undo weatherization work-it’s to coordinate insulation, air sealing, and window projects with HVAC professionals who can evaluate ventilation, verify safe combustion appliance operation, and recommend fresh-air solutions like heat recovery ventilators (HRVs) or energy recovery ventilators (ERVs).
If you already see signs of moisture or ventilation problems, delay additional weatherization work and schedule a Dor-Mar inspection before proceeding.
Three Core Strategies to Improve Indoor Air Quality
Most guidance from agencies like the Environmental Protection Agency and the Consumer Product Safety Commission centers on three pillars: source control, ventilation, and air cleaning. Poor IAQ can be managed by reducing pollutants at the source-and then layering in the other two strategies.
Source control is the most effective and often the least expensive approach. It means eliminating or reducing emissions at their origin:
- Don’t smoke indoors-the only reliable way to eliminate secondhand smoke exposure
- Vent all combustion appliances properly
- Fix water leaks and address mold promptly to prevent mold growth
- Choose low-VOC paints, sealants, and building materials
- Store chemicals in detached or well-ventilated areas
Increasing ventilation means bringing in more fresh air when outdoor air quality is acceptable. This includes opening windows on clean-air days, running bathroom exhaust fans during and after showers, using kitchen range hoods that vent outdoors during cooking, and installing mechanical fresh-air intakes. Ventilation helps reduce indoor air pollutants and allergens, particularly in tightly sealed homes. More tips on natural approaches are available in Dor-Mar’s guide on natural ways to improve indoor air quality.
Air cleaners and filtration form the third layer. High-MERV filters (MERV 11–13) in central HVAC systems catch fine particles; portable HEPA air cleaners target problem rooms; and whole-home systems treat every space served by ductwork. Using portable air cleaners can capture particulate matter and pollutants in rooms where vulnerable family members spend the most time.
No single strategy is a cure-all. An effective plan uses all three approaches, tailored to the home’s age, climate (Ohio vs. Florida), and family health needs.
Major Indoor Air Pollutants Every Homeowner Should Know
This section introduces the most common and serious indoor air pollutants found in U.S. homes, with a focus on those especially relevant to Central Ohio and Southwest Florida.
Indoor pollutants fall into several broad categories:
- Radioactive gases (radon)
- Combustion gases (carbon monoxide and nitrogen dioxide)
- Particles (smoke, dust, and soot)
- Organic gases (VOCs and formaldehyde)
- Biological contaminants (mold, bacteria, and allergens)
- Legacy hazards (asbestos and lead)
Each subsection below covers sources, health effects, and practical steps. A later section provides a quick-reference summary.
Radon (Rn)
Radon is a colorless, odorless gas that can cause lung cancer. It forms naturally from the decay of uranium in soil and rock, seeping into homes through foundation cracks, gaps around service pipes, and crawl spaces. Central Ohio sits squarely in EPA Radon Zone 1-the highest-potential classification-where most counties have predicted average indoor levels above 4.0 pCi/L.
Key facts about radon:
- The average indoor radon level is 1.3 pCi/L in homes nationally; Central Ohio averages roughly 4.7–5.0 pCi/L
- The EPA’s action level is 4.0 pCi/L, but risk persists at levels between 2.0 and 4.0 pCi/L
- Radon exposure causes about 14,000 lung cancer deaths annually in the U.S., with smokers facing the highest combined risk
- Florida generally falls into EPA Zone 2 (moderate potential), but local testing remains essential-especially in areas with limestone geology
Every home should be tested. In Ohio, test the basement or lowest livable level. In Florida, test the main living floor. Retest after major renovations or foundation work.
Dor-Mar provides radon testing and mitigation services, including sub-slab depressurization systems that reliably reduce radon levels below the action threshold. If your results come back elevated, learn what to do next in Dor-Mar’s guide on radon levels too high.
Environmental Tobacco Smoke (Secondhand Smoke)
Environmental tobacco smoke is a mixture of sidestream and exhaled smoke from cigarettes, cigars, and pipes. Environmental tobacco smoke contains over 7,000 chemicals, many of which are carcinogenic. When someone decides to smoke indoors, particle levels can rise to several times higher than outdoor concentrations, even with windows open or fans running.
Health impacts are severe:
- Increased risk of lung cancer and heart disease in nonsmoking adults
- Secondhand smoke increases asthma attacks in children
- Elevated risk of bronchitis, pneumonia, and ear infections in young children
- Secondhand tobacco smoke is a recognized lung disease trigger
The only effective solution is to prohibit smoking inside the home and vehicles entirely. Ask smokers to go outside, well away from doors and windows. Ventilation and air cleaners can reduce but not eliminate the toxic residue from tobacco smoke. Families with children, older adults, or anyone with respiratory or cardiovascular conditions should treat smoke-free indoor spaces as non-negotiable.
Biological Contaminants (Mold, Dust Mites, and More)
Biological contaminants include living or once-living particles: mold spores, bacteria, viruses, pet dander, cockroach debris, dust mites, and pollen that accumulate in indoor spaces. Common indoor triggers for respiratory conditions include dust mites and pet dander, which settle into carpets, bedding, and upholstered furniture.
Warm, damp environments are prime territory. Ohio basements with foundation seepage, Florida crawl spaces baking in subtropical heat, bathrooms without exhaust fans, and areas around leaking plumbing all become breeding grounds. Biological contaminants like mold thrive in high humidity environments. Mold growth is associated with humidity levels above 60%, and high humidity can promote mold and dust mite growth throughout the home.
Health effects include allergies, asthma attacks, sinus infections, skin rashes, and in some cases serious lung infections in immunocompromised individuals. Mold exposure can lead to allergic reactions and respiratory problems that persist until the source is eliminated.
Prevention strategies:
- Keep indoor humidity levels between 30–50% using dehumidifiers and properly maintained AC systems
- Repair leaks promptly and dry water-damaged materials within 24–48 hours
- Using allergen-proof mattress encasements minimizes exposure to dust mites in bedrooms
- Regular cleaning reduces dust mites and pet dander levels on surfaces and in fabrics
Dor-Mar installs and maintains humidity control solutions, improves ventilation, and inspects HVAC systems to reduce biological pollutant reservoirs-especially critical in Central Ohio basements and Florida attics, and their guidance on indoor air quality for allergy and asthma relief is especially helpful for sensitive households.
Stoves, Heaters, Fireplaces, and Chimneys
Combustion appliances-gas furnaces, boilers, hot water heaters, gas stoves and ovens, fireplaces, and space heaters-are major potential sources of carbon monoxide, nitrogen dioxide, and fine particles in the home environment.
Carbon monoxide can cause headaches and dizziness at low levels. At higher concentrations, it causes confusion, unconsciousness, and death. Carbon monoxide is a colorless, odorless gas from combustion, making it impossible to detect without equipment.
Critical safety steps:
- Schedule annual professional inspections and tune-ups for all combustion appliances, including furnace and flue checks
- Never use unvented gas or kerosene space heaters indoors
- Never run vehicles, generators, or gas-powered equipment in attached garages-exhaust can leak into living spaces through shared walls and ceiling gaps
- Install UL-listed carbon monoxide detectors on every level of the home and near sleeping areas
Dor-Mar technicians test for carbon monoxide during furnace and boiler tune-ups and can install CO alarms during HVAC or electrical service visits, and their guidance on pre-season furnace checks and cleaning highlights why this maintenance is so important. For Ohio homes preparing for winter, review Dor-Mar’s guide on furnace problems to watch for.
Household Products and Organic Gases (VOCs)
Volatile organic compounds are gases emitted from a wide range of household products: paints, solvents, aerosol sprays, cleaning products, air fresheners, adhesives, hobby supplies, and some building materials. They’re one of the most pervasive categories of chemical pollutants in the indoor environment.
Volatile organic compounds can be 2 to 5 times higher indoors than outdoors under normal conditions, and concentrations can spike dramatically during activities like painting, varnishing, or heavy cleaning. Short-term health effects include eye and respiratory irritation, headaches, dizziness, and nausea. Some VOCs-including benzene and formaldehyde-are linked to long-term cancer risk with prolonged exposure.
Practical steps to reduce exposure:
- Choose low-VOC paints, stains, and cleaning products
- Follow label directions carefully-more product does not mean better results
- Increase ventilation during and after using chemical products (open windows, run exhaust fans)
- Store chemicals in detached garages or well-ventilated utility rooms, not inside living spaces
- Dispose of unwanted products through community hazardous waste programs
Dor-Mar can advise on filtration and air cleaner options-including activated carbon systems like the iWave-C air purifier-that help reduce certain VOC levels in frequently used rooms.
Formaldehyde and Emissions from Building Materials
Formaldehyde is a common indoor pollutant released by pressed-wood products (particleboard, plywood, and medium-density fiberboard), certain insulation materials, textiles, and household products. It’s a particular concern during and after renovations when new materials are introduced.
High temperature and humidity can increase pollutant concentration, and formaldehyde emissions follow that pattern closely. This means homes in both Ohio summers and Florida’s year-round heat may see elevated off-gassing from new cabinets, flooring, and furniture.
Health effects include eye, nose, and throat irritation, headaches, allergic reactions, and potential increased cancer risk with long-term exposure.
When remodeling:
- Choose low-formaldehyde or “ULEF/NAF” (ultra-low emitting formaldehyde / no-added-formaldehyde) building materials
- Ventilate well when bringing new cabinets, flooring, or furniture indoors-open windows and run fans for at least several days
- Maintain temperature and humidity control, plus adequate fresh-air ventilation, particularly in newly built or recently remodeled rooms
Pesticides
Indoor pesticide use-sprays, foggers, bait stations, termite treatments, and disinfectants-can leave long-lasting chemical residues in carpets, dust, and on surfaces. Both active and so-called “inert” ingredients can contribute to eye, skin, and respiratory irritation. Some compounds have been linked to nervous system and developmental effects, particularly in children.
Safer approaches include integrated pest management (IPM):
- Seal entry points for insects and rodents
- Remove food and water sources that attract pests
- Use nonchemical traps and physical barriers before turning to chemical products
- When chemicals are necessary, follow label directions exactly, ventilate well, and store products securely away from children and pets
If hiring a pest control company, ask about low-toxicity options and treatment methods that minimize indoor air contamination. Never mix chemical products, and avoid using foggers (“bug bombs”) unless absolutely necessary-they coat every surface in the home with residue.
Asbestos and Lead in Older Homes
Asbestos and lead are “legacy” pollutants still present in many homes built before the late 1970s. Older housing stock in Central Ohio-particularly in Columbus, Gahanna, and Newark-and some mid-century Florida properties may contain both.
Asbestos fibers can be released when certain insulation, floor tiles, pipe wrapping, and textured ceiling materials are damaged, disturbed, or deteriorate with age. Inhalation of asbestos fibers can lead to lung cancer, mesothelioma, and asbestosis-diseases that may not appear until decades after exposure.
Lead hazards come from peeling or chipping lead-based paint, contaminated dust and soil, and older plumbing that can leach lead into drinking water. Lead exposure is especially dangerous for children’s brain development. Even low blood lead levels are harmful.
Key guidance:
- Intact asbestos materials are often best left undisturbed. Any repair or removal must be handled by licensed abatement professionals following EPA and state regulations.
- Use certified lead-safe contractors for any renovation work that disturbs old paint.
- Consider water testing if you live in an older neighborhood or have original plumbing fixtures-Dor-Mar’s plumbing team can help evaluate your situation, and Westerville homeowners can access local Dor-Mar experts for this type of assessment.
Reference Guide to Major Indoor Air Pollutants in the Home
This section serves as a quick-reference summary for major indoor pollutants, combining sources, typical health effects, and basic homeowner steps into skimmable entries. Health effects listed are associated with specific pollutants but may not occur at the levels found in every home-individual sensitivity and total exposure time matter.
Scientific understanding continues to evolve. Treat this guide as a starting point, not a diagnostic tool. Consult your doctor or local health department for medical concerns. For a full reference on pollutant-specific controls, the EPA’s “The Inside Story: Guide to Indoor Air Quality” provides detailed chapters.
Carbon Monoxide (CO)
- Sources: Malfunctioning or improperly vented gas furnaces, boilers, water heaters, fireplaces, gas stoves, vehicles idling in attached garages, and portable generators used too close to the home.
- Health effects: Fatigue, chest pain, headaches, dizziness, nausea, confusion, and-at high levels-loss of consciousness and death. CO poisoning can occur silently during sleep.
- What to do: Schedule annual service for all combustion appliances, ensure adequate draft and venting, and install CO detectors on every floor and near sleeping areas. Dor-Mar technicians test for carbon monoxide during central heating system tune-ups and can install or replace alarms as part of a safety package, with dedicated HVAC and IAQ services for Newark-area homeowners.
- Never ignore a CO alarm. Evacuate immediately and contact emergency services and a qualified contractor.
Nitrogen Dioxide (NO2)
- Sources: Gas stoves and ovens, unvented heaters, and tobacco smoke. Levels are highest in small or poorly ventilated kitchens and living spaces.
- Health effects: Eye, nose, and throat irritation; reduced lung function; increased risk of respiratory infections-especially in children and people with asthma or lung disease.
- What to do: Always use range hoods vented outdoors while cooking on gas. Avoid unvented gas or kerosene heaters indoors. Consider upgrading to properly vented appliances or electric alternatives during kitchen remodels, especially for families with respiratory conditions. Improved kitchen ventilation and regular HVAC filter maintenance can significantly reduce NO2-related problems.
Organic Gases (VOCs) and Respirable Particles
Organic gases (VOCs) and fine particulate matter (PM2.5) frequently elevate during everyday activities: cooking, cleaning, burning candles, or using wood-burning fireplaces. Fine particles can lodge deep in the lungs and even enter the bloodstream, contributing to asthma attacks, heart problems, and other serious health effects during long-term or prolonged exposure.
Steps to reduce exposure:
- Use exhaust fans while cooking
- Minimize indoor burning (candles, incense, wood fires)
- Choose low-emission cleaning and personal care products
- Install high-efficiency air filters (MERV 11–13, where compatible with your HVAC system) and consider portable HEPA air cleaners for commonly used rooms
Ask Dor-Mar technicians which filter ratings your existing system can handle safely without compromising airflow or equipment life, and review their guide to choosing the right air filter for your home to understand how MERV, size, and materials affect performance.
Ready for a tailored evaluation? Contact Dor-Mar for an indoor air quality assessment based on your home’s age, location, and your family’s health conditions by reaching out through their dedicated contact page for service requests.
How Dor-Mar Improves Indoor Air Quality: Practical Solutions
Dor-Mar Heating, Air Conditioning & Plumbing has been helping Central Ohio families since 1962 and now also serves Southwest Florida, combining decades of HVAC experience with modern indoor air quality tools as a family-owned, community-focused HVAC contractor.
A typical service visit begins with a walk-through: questions about health concerns, visual inspection of HVAC equipment, and checks for moisture, mold, or ventilation issues. The goal is to understand what’s happening in your specific home before recommending anything.
Dor-Mar’s main indoor air quality services include many of the offerings highlighted on their comprehensive home services overview:
- Furnace and AC maintenance, including combustion safety testing
- Duct inspections and sealing
- Installation of high-MERV filters and whole-home air cleaners
- Humidity control solutions (dehumidifiers for Ohio basements, proper AC sizing for Florida humidity)
- Radon testing and mitigation
- Carbon monoxide safety checks and detector installation
- UV germicidal light systems for cooling systems and ductwork
Every recommendation is tailored to the specific home-its age, location, existing equipment, and family needs-rather than one-size-fits-all products. Maintaining good indoor air quality in your home environment means matching solutions to real conditions.
Schedule a free estimate or book service online. Join Dor-Mar’s Home Comfort Membership for priority service, regular safety checks, and filter change reminders that keep your indoor air on track without the guesswork.
Step-by-Step: Improving the Air Quality in Your Home
Here’s a practical roadmap with steps you can start today, plus deeper fixes best handled by professionals.
Start with the basics:
- Remove obvious sources: stop smoking indoors, unplug scented plug-in devices, and switch to fragrance-free or low-VOC cleaning products.
- Open windows on days with acceptable outdoor air quality to flush stale air out.
- Run kitchen and bathroom exhaust fans while cooking and showering-and for 15–20 minutes afterward.
- Regular cleaning reduces dust mites and pet dander levels. Vacuum with a HEPA-equipped vacuum, wash bedding weekly in hot water, and wipe hard surfaces with damp cloths to trap dust rather than spreading it.
Upgrade your filtration:
Replace HVAC filters on a regular schedule-often every one to three months, depending on household conditions. Air filters need regular maintenance to remain effective. Consider upgrading to a higher-quality filter compatible with your system. Dor-Mar can advise on the right MERV rating, and their guide on why you should routinely change home air filters explains the impact clearly.
Control humidity:
Use dehumidifiers in damp Ohio basements. Ensure cooling systems are properly sized and maintained in Florida to avoid clammy indoor conditions and prevent mold growth. Target relative humidity levels of 30–50%. Humidity control can reduce respiratory problems in occupants and protect your home’s structure.
Know when to call a professional:
DIY steps aren’t enough when you’re dealing with persistent mold, unexplained health symptoms, CO alarm activations, or radon test results above 4.0 pCi/L. These situations call for a professional indoor air quality evaluation from Dor-Mar.
Frequently Asked Questions About Indoor Air Quality
Below are common questions homeowners ask Dor-Mar about testing, monitoring, and improving indoor air quality. Answers are tailored to homes in Central Ohio and Southwest Florida.
How often should I have my home’s air quality checked?
Most homes benefit from a professional indoor air quality review every one to three years, or sooner after renovations, new appliance installations, or if family members develop unexplained respiratory or allergy symptoms. Annual HVAC maintenance visits from Dor-Mar are a convenient time to review IAQ concerns, check filters, inspect ductwork, and confirm safe combustion venting.
Specific tests like radon should follow EPA guidance-testing at least every two years in areas with known radon potential (virtually all of Central Ohio), and after major structural changes to the home. Dor-Mar’s Home Comfort Membership bundles routine checks and filter changes so you don’t have to remember dates.
Call Dor-Mar anytime you notice sudden changes: strong new odors, visible mold, or frequent headaches at home.
Are indoor air quality monitors worth buying for my home?
Consumer IAQ monitors can be useful tools for tracking humidity, carbon dioxide, and sometimes particulates and VOCs, giving you a sense of trends and problem areas. They’re best used as early-warning or awareness tools and do not replace professional diagnostics for issues like carbon monoxide leaks, elevated radon gas levels, or significant mold contamination.
Place monitors in main living areas and bedrooms, away from direct vents or open windows, and follow manufacturer calibration and maintenance instructions. Share monitor data with Dor-Mar technicians during service visits to help target solutions more effectively.
If a monitor shows consistently high carbon dioxide or humidity readings, it often indicates the need for better ventilation or dehumidification-problems Dor-Mar can address with the right equipment and adjustments to your outdoor ventilation rate.
What’s the difference between a portable air purifier and a whole-home air cleaner?
Portable air purifiers are room-sized devices, typically equipped with HEPA and sometimes carbon filters, that can significantly improve air quality in a single bedroom or living area when correctly sized and maintained. Air purifiers with HEPA filters reduce airborne allergens effectively in the rooms where they operate.
Whole-home air cleaners integrate into your central HVAC system, treating the air in all rooms served by ductwork whenever the system runs. They’re more convenient for families with multiple rooms to protect and eliminate the need to move devices around the house.
Dor-Mar installs and services whole-home air cleaners and can also advise on how to use portable units alongside central filtration. Consider both coverage and filter replacement costs when deciding which approach fits your budget and health needs.
Can houseplants really clean my indoor air?
Indoor plants can reduce volatile organic compounds (VOCs) under controlled laboratory conditions. NASA’s 1989 study suggested plants can improve air quality by absorbing certain pollutants, and plants release oxygen and increase humidity indoors, which can feel pleasant. However, a significant number of plants are needed for effective VOC removal in a real-world home-far more than most living rooms can accommodate.
Plants can also increase indoor humidity and may contribute to mold or pollen issues for sensitive individuals if overwatered. Enjoy indoor plants for their aesthetic and psychological benefits, but don’t rely on them as a primary air quality solution. Proven methods-source control, proper ventilation, and mechanical filtration-deliver far more impact per dollar spent.
Dor-Mar can help design an IAQ plan that relies on engineering, not gardening, for pollution control.
When should I consider upgrading my HVAC system for better air quality?
Consider upgrades if your current system cannot support higher-efficiency air filters, struggles to control relative humidity, or has frequent breakdowns that compromise comfort and air quality. Specific scenarios that point toward an upgrade:
- Family members with asthma, heart disease, or chronic respiratory conditions
- Persistent odors or dust despite regular cleaning and filter changes
- Systems older than 15 years that lack modern filtration, variable-speed blowers, or humidity management
- Office equipment or work-from-home setups that add heat and pollutant load to small rooms
Upgrades may include variable-speed blowers, whole-home dehumidifiers or humidifiers, integrated fresh-air ventilation, and advanced filtration or UV treatment. Dor-Mar offers free estimates for new system installations and can evaluate whether repairs, add-ons, or full replacement will deliver the best improve air quality and comfort outcome.
Schedule a consultation before peak heating or cooling seasons in Ohio and Florida to avoid delays and ensure systems are ready when you need them most. Call Dor-Mar or book online to get started.
