Practice Test Geeks(AQS) Air Quality Specialist Certification Practice Test
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AQS Indoor Air Quality Flashcards

6 cards from real AQS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 AQS Indoor Air Quality flashcards as text

  1. Biological contaminants in indoor air quality include all of the following EXCEPT:

    Answer: Radon gas

    Radon is a radioactive gas, not a biological contaminant; mold, dust mites, Legionella, and pollen are examples of biological (microbial and allergen) indoor air contaminants.

  2. The primary control strategy for reducing mold growth in buildings is:

    Answer: Controlling moisture and relative humidity below 60%

    Mold requires moisture to grow; maintaining indoor relative humidity below 60% (ideally 30–50%) and promptly addressing water intrusion is the most effective mold prevention strategy.

  3. HEPA filters used in air purifiers are required to remove at least what percentage of particles ≥ 0.3 micrometers?

    Answer: 99.97%

    By definition, a HEPA (High Efficiency Particulate Air) filter must capture at least 99.97% of airborne particles with a diameter of 0.3 micrometers or larger.

  4. What is the purpose of a blower door test in the context of indoor air quality?

    Answer: Quantifying building air leakage to assess infiltration and ventilation

    A blower door test depressurizes a building to measure its air leakage rate (expressed in ACH50 or CFM50), informing decisions about ventilation adequacy and contaminant infiltration pathways.

  5. Legionella pneumophila, the bacterium causing Legionnaires' disease, most commonly spreads indoors through:

    Answer: Aerosolized water droplets from contaminated cooling towers or hot water systems

    Legionella thrives in warm water systems (cooling towers, hot water tanks, decorative fountains) and becomes an inhalation hazard when contaminated water is aerosolized into fine droplets.

  6. The EPA's Indoor Air Plus label program encourages construction practices that address:

    Answer: A comprehensive set of indoor pollutant sources including moisture, combustion, radon, pests, and ventilation

    EPA Indoor airPLUS is a voluntary new-home construction program with specifications covering moisture control, combustion safety, radon mitigation, pest management, HVAC filtration, and ventilation.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. app.glueup.com — Test delivery, score release, score validity · verified Oct 2026
  2. basementhealth.org — Eligibility, renewal, fees · verified Oct 2026