AQS AQS Indoor Air Quality 2

Question 1

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

Accepted Answer

Radon gas

Answer

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.

Question 2

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

Accepted Answer

Controlling moisture and relative humidity below 60%

Answer

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.

Question 3

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

Accepted Answer

99.97%

Answer

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.

Question 4

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

Accepted Answer

Quantifying building air leakage to assess infiltration and ventilation

Answer

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.

Question 5

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

Accepted Answer

Aerosolized water droplets from contaminated cooling towers or hot water systems

Answer

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.

(AQS) Air Quality Specialist Certification Practice Test

(AQS) Air Quality Specialist Certification Practice Test

AQS AQS Indoor Air Quality 2