Air Quality Testing Problems in a Maryland Home Inspection: Causes and Remedies

What Remedies Are Available if Air Quality Testing Fails During a Home Inspection?

Indoor air quality testing can sometimes reveal problems during a home inspection. Elevated mold spores, radon gas, volatile organic compounds (VOCs), or combustion gases may show up in the test results.

For home buyers in Maryland, this situation is not uncommon. Moisture in basements, regional radon levels, and tightly sealed homes can all affect indoor air quality.

The good news is that most air quality issues discovered during a home inspection have clear solutions. The key is identifying the source of the problem and addressing it before moving forward with the purchase.

Below are the most common issues uncovered during air quality testing and how they are typically resolved.

Step 1: Understand What the Air Quality Test Detected

Air quality testing can identify several different types of contaminants inside a home. Each one usually has a different cause and solution.

Mold Spores

Mold spores are often caused by moisture problems such as roof leaks, basement humidity, plumbing leaks, or poor ventilation.

Typical solutions include:

• Fixing the moisture source
• Removing contaminated materials
• Professional mold remediation
• Improving ventilation or dehumidification

Homes with basements or crawlspaces in Maryland are particularly prone to moisture-related mold issues.

Radon Gas

Radon is a naturally occurring radioactive gas that enters homes from the soil beneath the foundation. Many areas of Maryland have moderate to elevated radon levels.

If a radon test comes back high, the standard solution is installing a radon mitigation system, typically a sub-slab depressurization system that vents the gas safely outside the home.

Radon mitigation systems are common and generally reduce radon levels quickly and effectively.

Volatile Organic Compounds (VOCs)

VOCs are gases released from building materials and household products such as paint, flooring, adhesives, cabinetry, and cleaning chemicals.

Recently renovated homes often have higher VOC levels.

Remedies usually include:

• Increasing ventilation
• Using air purification systems
• Replacing high-emission materials
• Allowing time for new materials to off-gas

Carbon Monoxide or Combustion Gases

Carbon monoxide can come from malfunctioning furnaces, gas water heaters, fireplaces, or improperly vented appliances.

Solutions may involve:

• Servicing or replacing gas appliances
• Correcting venting problems
• Installing carbon monoxide detectors on every level of the home

Because carbon monoxide is odorless and colorless, detection and proper appliance maintenance are essential.

Particulates (Dust, Smoke, and Fine Particles)

Airborne particulates such as dust, smoke residue, and fine particles can build up in homes with poor filtration or ventilation.

Typical remedies include:

• Upgrading HVAC filters to MERV 11–13
• Cleaning HVAC systems
• Using HEPA air purifiers
• Improving ventilation and air circulation

Step 2: Fix the Source of the Problem

One of the most important principles of indoor air quality remediation is addressing the underlying cause rather than simply filtering the air.

Common corrective actions include:

• Repairing roof, plumbing, or foundation leaks
• Removing water-damaged drywall, insulation, or carpet
• Cleaning or upgrading HVAC filtration systems
• Servicing furnaces, boilers, or water heaters
• Adding dehumidifiers in damp basements or crawlspaces
• Installing ventilation fans in bathrooms, kitchens, or laundry rooms

In humid climates like Maryland, controlling moisture is often the most important step.

Step 3: Consider Professional Remediation Services

If testing reveals significant contamination, professional remediation may be necessary.

Common specialists involved in indoor air quality remediation include:

• Mold remediation contractors — Certified professionals who remove contaminated materials, perform HEPA cleaning, and treat affected areas.
• Radon mitigation specialists — Professionals who install radon reduction systems to vent radon gas from beneath the home.
• Indoor air quality consultants or industrial hygienists — Experts who conduct detailed investigations when pollutants are difficult to trace.

Hiring qualified professionals ensures that remediation is performed safely and effectively.

Step 4: Improve Ventilation and Air Filtration

After addressing the source of contamination, improving air circulation can help maintain healthy indoor air.

Options may include:

• Installing energy recovery ventilators (ERVs) or heat recovery ventilators (HRVs)
• Using portable HEPA air purifiers in key areas
• Maintaining indoor humidity between 35% and 50%
• Sealing and conditioning crawlspaces
• Installing moisture barriers in basements

Proper ventilation helps prevent many indoor air quality problems from returning.

Step 5: Conduct Follow-Up Air Quality Testing

Once remediation is complete, follow-up testing is often recommended.

A second air quality test can confirm that contaminant levels have returned to normal. In many cases, remediation companies will provide a clearance test or verification report documenting that the issue has been resolved.

These records can be helpful for both buyers and sellers in real estate transactions.

Step 6: Negotiation Options for Home Buyers

If air quality problems are discovered during a home inspection, buyers typically have several options depending on the severity of the issue.

Possible next steps include:

• Requesting professional remediation before closing
• Negotiating a seller credit for repairs
• Asking for re-testing after repairs are completed
• Canceling the contract under the inspection contingency

In Maryland real estate transactions, environmental hazards such as mold or radon may be considered material defects if they are known and not disclosed.

Step 7: Preventing Future Air Quality Problems

After purchasing the home, ongoing maintenance can help prevent indoor air quality issues from returning.

Recommended practices include:

• Annual HVAC servicing
• Changing air filters regularly
• Using low-VOC materials when remodeling
• Maintaining proper drainage around the home
• Installing radon and carbon monoxide detectors
• Inspecting basements and crawlspaces for moisture

Preventative maintenance plays a major role in maintaining healthy indoor air.