Virginia Indoor Air Quality Technician Exam
Questions & Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A
SECTION 1: IAQ FUNDAMENTALS AND CORE CONCEPTS
1. During an indoor air quality investigation in a commercial office,
which factor is most commonly associated with occupant complaints
involving headaches, eye irritation, and fatigue despite the absence of
specific toxic contaminants?
A. Elevated indoor humidity exceeding 100%
B. Poor ventilation and inadequate outdoor air exchange
C. Excessive outdoor pollen infiltration only
D. Excessive lighting intensity
Rationale: Poor ventilation allows contaminants to accumulate indoors and is
one of the most common causes of nonspecific occupant symptoms
collectively associated with poor indoor air quality.
2. What is the primary purpose of an indoor air quality (IAQ)
assessment?
A. To measure energy efficiency of the building
B. To identify sources of indoor air contaminants and assess exposure
risks
C. To inspect plumbing systems for leaks
D. To check fire safety compliance
Rationale: The main goal of IAQ assessments is to detect pollutants and
evaluate health risks for building occupants.
3. Which of the following BEST defines "indoor air quality" (IAQ) as used
in Virginia regulations?
,A. The temperature and humidity levels within a building
B. Air quality within buildings and structures, especially as it relates to
the health and comfort of building occupants
C. The amount of outdoor air entering a building
D. The efficiency of the HVAC system
Rationale: Virginia law defines indoor air quality as air quality within
buildings and structures, especially as it relates to the health and comfort of
building occupants.
4. According to the EPA, indoor air can be up to how many times more
polluted than outdoor air?
A. 2 times
B. 3 times
C. 5 times
D. 10 times
Rationale: According to the U.S. Environmental Protection Agency (EPA),
indoor air can be up to five times more polluted than the air outside.
5. Which of the following is considered a common biological indoor air
contaminant?
A. Carbon monoxide
B. Lead dust
C. Mold spores
D. Asbestos fibers
Rationale: Mold spores are biological contaminants that can impact
respiratory health and are commonly found in indoor environments.
6. What is the most common method for measuring relative humidity
indoors?
A. Thermometer
B. Hygrometer
,C. Barometer
D. Anemometer
Rationale: A hygrometer is the standard instrument used to measure relative
humidity in indoor environments.
7. Which of the following is NOT a typical responsibility of an IAQ
technician?
A. Conducting building inspections
B. Performing structural engineering calculations
C. Collecting air samples
D. Interpreting laboratory sample reports
Rationale: IAQ technicians focus on evaluating indoor air quality, identifying
problems, and recommending solutions, not structural engineering.
8. Which particle size is most likely to remain airborne for long periods
and penetrate deep into the lungs?
A. >10 microns
B. 5–10 microns
C. <2.5 microns (PM2.5)
D. 3–5 microns
Rationale: PM2.5 particles are small enough to bypass upper respiratory
defenses and reach the alveoli, making them particularly harmful.
9. HEPA filters are designed to remove particles as small as:
A. 10 microns
B. 5 microns
C. 0.3 microns
D. 1 micron
Rationale: HEPA filters are highly efficient at capturing particles down to 0.3
microns, which is the most penetrating particle size.
, 10. Under Virginia law, the provisions of the Indoor Air Quality article
apply to:
A. All commercial buildings in the Commonwealth
B. Public school buildings occupied by school board employees and
students during regular work and school hours
C. All residential properties
D. Only state government buildings
Rationale: Virginia Code § 22.1-141.3 specifies that the provisions apply to
matters relating to indoor air quality in public school buildings.
SECTION 2: BUILDING SCIENCE AND HVAC SYSTEMS
11. Which HVAC component is primarily responsible for filtering
airborne particles?
A. Compressor
B. Condenser coil
C. Air filter
D. Evaporator coil
Rationale: Air filters trap dust, pollen, and other particles to maintain indoor
air quality.
12. What is the primary purpose of ventilation in an HVAC system?
A. To cool the building
B. To provide fresh outdoor air and remove indoor pollutants
C. To heat the building
D. To distribute refrigerant
Rationale: Ventilation provides fresh air exchange and helps dilute and
remove indoor air pollutants.
13. ASHRAE Standard 62.1 specifies:
Questions & Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A
SECTION 1: IAQ FUNDAMENTALS AND CORE CONCEPTS
1. During an indoor air quality investigation in a commercial office,
which factor is most commonly associated with occupant complaints
involving headaches, eye irritation, and fatigue despite the absence of
specific toxic contaminants?
A. Elevated indoor humidity exceeding 100%
B. Poor ventilation and inadequate outdoor air exchange
C. Excessive outdoor pollen infiltration only
D. Excessive lighting intensity
Rationale: Poor ventilation allows contaminants to accumulate indoors and is
one of the most common causes of nonspecific occupant symptoms
collectively associated with poor indoor air quality.
2. What is the primary purpose of an indoor air quality (IAQ)
assessment?
A. To measure energy efficiency of the building
B. To identify sources of indoor air contaminants and assess exposure
risks
C. To inspect plumbing systems for leaks
D. To check fire safety compliance
Rationale: The main goal of IAQ assessments is to detect pollutants and
evaluate health risks for building occupants.
3. Which of the following BEST defines "indoor air quality" (IAQ) as used
in Virginia regulations?
,A. The temperature and humidity levels within a building
B. Air quality within buildings and structures, especially as it relates to
the health and comfort of building occupants
C. The amount of outdoor air entering a building
D. The efficiency of the HVAC system
Rationale: Virginia law defines indoor air quality as air quality within
buildings and structures, especially as it relates to the health and comfort of
building occupants.
4. According to the EPA, indoor air can be up to how many times more
polluted than outdoor air?
A. 2 times
B. 3 times
C. 5 times
D. 10 times
Rationale: According to the U.S. Environmental Protection Agency (EPA),
indoor air can be up to five times more polluted than the air outside.
5. Which of the following is considered a common biological indoor air
contaminant?
A. Carbon monoxide
B. Lead dust
C. Mold spores
D. Asbestos fibers
Rationale: Mold spores are biological contaminants that can impact
respiratory health and are commonly found in indoor environments.
6. What is the most common method for measuring relative humidity
indoors?
A. Thermometer
B. Hygrometer
,C. Barometer
D. Anemometer
Rationale: A hygrometer is the standard instrument used to measure relative
humidity in indoor environments.
7. Which of the following is NOT a typical responsibility of an IAQ
technician?
A. Conducting building inspections
B. Performing structural engineering calculations
C. Collecting air samples
D. Interpreting laboratory sample reports
Rationale: IAQ technicians focus on evaluating indoor air quality, identifying
problems, and recommending solutions, not structural engineering.
8. Which particle size is most likely to remain airborne for long periods
and penetrate deep into the lungs?
A. >10 microns
B. 5–10 microns
C. <2.5 microns (PM2.5)
D. 3–5 microns
Rationale: PM2.5 particles are small enough to bypass upper respiratory
defenses and reach the alveoli, making them particularly harmful.
9. HEPA filters are designed to remove particles as small as:
A. 10 microns
B. 5 microns
C. 0.3 microns
D. 1 micron
Rationale: HEPA filters are highly efficient at capturing particles down to 0.3
microns, which is the most penetrating particle size.
, 10. Under Virginia law, the provisions of the Indoor Air Quality article
apply to:
A. All commercial buildings in the Commonwealth
B. Public school buildings occupied by school board employees and
students during regular work and school hours
C. All residential properties
D. Only state government buildings
Rationale: Virginia Code § 22.1-141.3 specifies that the provisions apply to
matters relating to indoor air quality in public school buildings.
SECTION 2: BUILDING SCIENCE AND HVAC SYSTEMS
11. Which HVAC component is primarily responsible for filtering
airborne particles?
A. Compressor
B. Condenser coil
C. Air filter
D. Evaporator coil
Rationale: Air filters trap dust, pollen, and other particles to maintain indoor
air quality.
12. What is the primary purpose of ventilation in an HVAC system?
A. To cool the building
B. To provide fresh outdoor air and remove indoor pollutants
C. To heat the building
D. To distribute refrigerant
Rationale: Ventilation provides fresh air exchange and helps dilute and
remove indoor air pollutants.
13. ASHRAE Standard 62.1 specifies:
