Indoor Air Quality and Mold Inspection Review

Mold is a naturally occurring phenomenon that exists both in outdoor and indoor environments.
Contamination is not guaranteed to be the primary indoor air problem in every given situation, as it is only one of many issues that can negatively affect air quality.
According to data from the Environmental Protection Agency (EPA), Americans spend approximately $90\%$ of their time indoors.

The EPA reports that levels of indoor pollutants are frequently significantly higher than outdoor levels, typically ranging from $2 \times$ to $5 \times$ higher.
In extreme cases, indoor pollutant levels can be found to be $100 \times$ higher than those found outdoors.
Within residential homes, air quality problems can originate from several specific sources and activities:
- Cooking processes.
- Use of personal care products.
- Use of household cleaning products.
- Pesticide application.
- Hobbies.
- Exposure to secondhand smoke.
Structural and mechanical factors contributing to poor air quality include:
- HVAC systems.
- Construction methods used during building.
- Specific materials used in construction.
External factors that can influence indoor air quality include radon and general outdoor pollution.

Occupants exhibit varying degrees of sensitivity to air quality issues; some individuals may react strongly to a specific problem while others remain unaffected.
Public and commercial buildings present complex air quality profiles due to multiple influences. These buildings include:
- Apartment buildings.
- Hospitals.
- Schools.
- Shopping malls.
Examples of site-specific pollutants in commercial settings include:
- Shopping Malls: Sources such as beauty salons, print shops, and cleaning or repair services.
- Offices: Toners, solvents, and cleaning products.
Minor modifications to a building, such as the installation of interior room dividers or new office equipment, can lead to direct or indirect air quality problems.

Management decisions to reduce utility costs can sometimes result in what the EPA terms a "false economy."
False economy measures can lead to an increase in occupant complaints, reduced productivity, and higher rates of absenteeism.
The preferred method for controlling indoor contaminants and odors is dilution with outdoor air.
For dilution to be effective, there must be a consistent and appropriate flow that ensures outdoor air is mixed effectively with the indoor air volume.

Ventilation efficiency is the term used to describe a system's capacity to distribute supply air and remove pollutants generated internally.
A building should be viewed as an integrated air distribution system comprising rooms, connections, chases, corridors, stairways, and elevator shafts.
Airflow patterns within a structure result from the combination of mechanical ventilation systems, natural forces, and human activity.
Heating, Ventilation, and Air Conditioning (HVAC) systems are the main pathway and driving force for air movement and include components such as:
- Furnaces.
- Boilers.
- Cooling towers.
- Air handling units.
- Exhaust fans.
- Ductwork.
- Filters.
- Steam or heating water piping.
A properly designed and functioning HVAC system provides comfort, distributes the correct amount of outdoor air, and removes contaminants and odors.
Outdoor contaminants that systems must filter or manage include pollen, dust, fungal spores, pesticides, standing water, vehicle exhaust, and dumpster odors.

Typical symptoms of indoor air quality issues include:
- Headache and fatigue.
- Cough and shortness of breath.
- Sinus congestion and sneezing.
- Dizziness and nausea.
- Skin irritation.
- Irritation of the eyes, nose, and throat.
There is significant uncertainty regarding what specific concentrations or periods of exposure duration are required to produce specific health conditions.
Failure to correct air quality issues can lead to persistent health problems such as allergic reactions, chronic cough, and eye irritation.
Rare but life-threatening conditions associated with indoor environments include Carbon Monoxide poisoning and Legionnaires' disease.
Mold inspectors are not qualified to make health recommendations or claims; occupants experiencing health issues should contact a health care professional immediately.

In the workplace, indoor air issues can result in:
- Decreased productivity.
- Increased absenteeism.
- Strained relations between employers and employees.
For landlords, consequences include:
- Strained tenant relations.
- Potential lawsuits.
- Negative publicity leading to a competitive disadvantage for rental properties.
Indoor air quality issues can also accelerate the physical deterioration of valuable equipment and furnishings.

Sick Building Syndrome (SBS):
- Describes cases where occupants experience acute health and comfort effects linked to time spent in a building, without a specific identifiable illness or cause.
- Symptoms include difficulty breathing, watering eyes, headache, allergic rhinitis, and flu-like symptoms.
- SBS originated largely due to energy-saving measures taken during the oil embargoes of the mid- $1970$ s.
- Since that time, buildings have been "built tight" to reduce energy costs, which unintentionally trapped contaminants indoors.
- Metaphor of the Box: If a building is thought of as a box containing something like a fungus, it is only a matter of time before the concentration of compounds inside the box affects human health.
Building Related Illness (BRI):
- Involves specific diagnostic criteria and testing that can confirm a condition.
- Allergic Conditions: Asthma and hypersensitivity pneumonitis.
- Infectious Conditions: Legionnaires' disease.
- Toxicological Conditions: Carbon monoxide toxicity, organic dust toxic syndrome, and fiberglass induced dermatitis.
While BRI conditions are well recognized, they represent a disproportionately small percentage of the health effects documented in buildings contaminated with mold.

It is more cost-effective to prevent indoor air problems than to resolve them after they have developed.
Meticulous maintenance helps put clients in a strong ethical and legal position should problems arise.
If a problem is suspected, it must be investigated immediately.
For specific pollutants like lead, asbestos, or radon, clients should be directed to state and local health departments.
Mold inspectors must exercise caution when serious pollutants are suspected during an investigation.