Indoor Air Quality Testing FAQ

What is Indoor Air Quality testing?

Indoor Air Quality testing evaluates conditions and contaminants that can affect the air inside a home. Depending on the concerns being investigated, testing may measure temperature, relative humidity, particulate matter, VOCs, mold spores, carbon dioxide, carbon monoxide, hydrogen sulfide, ozone, formaldehyde, chlorine, ammonia, oxygen concentration, and other environmental conditions.

Why should I have my home’s indoor air tested?

Professional IAQ testing can be useful when homeowners have concerns about unexplained odors, excessive dust, humidity, ventilation, recent renovations, water damage, mold, chemical contamination, combustion conditions, or other indoor environmental concerns.

Testing can also provide objective information when there are concerns that cannot be identified through visual observation or smell alone.

What does 5D Home Inspections test for?

Depending on the assessment, 5D Home Inspections can evaluate:

• Temperature
• Relative humidity
• Total volatile organic compounds (TVOC)
• Individual VOCs
• Mold-related VOCs
• Particulate matter from 0.3 to 10 microns
• Carbon dioxide (CO₂)
• Carbon monoxide (CO)
• Hydrogen sulfide (H₂S)
• Ozone (O₃)
• Formaldehyde
• Chlorine (Cl₂)
• Ammonia (NH₃)
• Oxygen concentration (O₂)
• Airborne mold
• Airborne particulate characteristics

The specific testing performed depends on the conditions and concerns being investigated.

Can indoor air quality problems exist without an odor?

Yes. Some contaminants and environmental conditions may not produce an obvious odor. For example, carbon monoxide is colorless and odorless, while some chemical compounds may be present without a noticeable smell.

Testing can provide information that cannot be obtained through sight or smell alone.

What are common causes of indoor air quality problems?

Common sources include poor ventilation, excess humidity, moisture intrusion, HVAC systems, combustion appliances, building materials, furniture, cleaning products, fragrances, renovations, household activities, and outdoor pollutants.

Different homes can have different sources, which is why testing and observations of the property are important when investigating an IAQ concern.

Does an air-quality monitor test for everything?

No. Different contaminants require different measurement methods.

A consumer monitor may measure certain parameters such as particulate matter, temperature, humidity, or VOC levels, depending on the device. It cannot replace every type of professional sensor, air sample, or laboratory analysis.

Professional IAQ testing uses different instruments and sampling methods for different environmental conditions.

What is TVOC testing?

TVOC stands for Total Volatile Organic Compounds. TVOC testing measures the overall concentration of volatile organic compounds in the indoor air.

VOCs can be released by products and materials such as paints, flooring, furniture, cabinetry, adhesives, cleaning products, fragrances, and building materials.

Can IAQ testing identify individual VOCs?

Yes, certain testing methods can provide information about individual VOCs.

5D Home Inspections can use Thermal Desorption Tube sampling to collect VOCs from indoor air. The samples can then be submitted to a qualified laboratory for analysis.

This type of testing can provide more detailed information than a general TVOC measurement.

What is a Home Contamination Index?

The Home Contamination Index provides additional analysis of significant VOCs detected within the indoor environment.

The report can identify compounds associated with EPA Hazardous Air Pollutants and odor-producing compounds, helping provide additional information about potential chemical contaminants within the home.

How is airborne mold tested?

Airborne mold sampling uses specialized equipment to collect mold spores and other fungal particles from the air.

A calibrated sampling pump draws a specific volume of air through a collection device. The sample is then submitted to a qualified laboratory for analysis.

Indoor samples may be compared with outdoor reference samples or samples from other areas of the home.

Does mold sampling alone determine whether a home has a mold problem?

No. Airborne mold results should be considered alongside observations and moisture findings.

Mold concentrations can change based on weather, HVAC operation, ventilation, occupant activity, and other conditions. Airborne sampling is one component of an overall indoor environmental assessment.

What is particulate matter?

Particulate matter consists of tiny airborne particles that can remain suspended in the air.

5D Home Inspections can evaluate particle concentrations across multiple size ranges, including 0.3, 0.5, 1.0, 2.5, 5.0, and 10 microns.

Particle measurements can provide information about conditions involving dust, smoke, outdoor pollution, HVAC operation, construction activity, allergens, and other potential sources.

Why is PM2.5 important in indoor air testing?

PM2.5 refers to particulate matter approximately 2.5 microns or smaller in diameter. Smaller particles can remain suspended in the air for longer periods and can penetrate more deeply into the respiratory system.

Measuring multiple particle sizes provides additional information about the particulate conditions within a home.

Does IAQ testing replace carbon monoxide alarms?

No. Indoor Air Quality testing does not replace properly installed and maintained carbon monoxide alarms.

Carbon monoxide is a serious safety concern, and appropriate carbon monoxide detection should be maintained in the home.

Can IAQ testing diagnose health problems?

No. Indoor Air Quality testing is an environmental assessment, not a medical diagnosis.

If someone is experiencing persistent or concerning symptoms, they should consult a qualified healthcare professional for appropriate medical evaluation and guidance.

How does professional IAQ testing differ from a consumer air-quality monitor?

Professional testing can use specialized instruments, targeted sampling methods, and laboratory analysis designed for specific environmental conditions.

Factors such as calibration, detection ranges, sampling duration, airflow, placement, and interpretation can affect the quality of the information collected.

Professional testing can therefore provide a broader assessment than relying on one general-purpose household monitor.

How long does an Indoor Air Quality test take?

The time required depends on the type and scope of testing being performed. Different measurements and laboratory samples may require different collection methods and durations.

5D Home Inspections can determine the appropriate testing approach based on the concerns being investigated.

What should I do if I am concerned about the air in my home?

Persistent odors, excessive dust, humidity concerns, recent renovations, water damage, suspected mold, ventilation concerns, or other unusual indoor environmental conditions may warrant further evaluation.

Professional Indoor Air Quality testing can provide objective information about the conditions inside the home and help homeowners better understand what they are breathing.