CMI Indoor Air Quality Assessment 2

Question 1

According to ACGIH guidelines, which relative humidity range is considered optimal to minimize mold growth while maintaining occupant comfort?

Accepted Answer

30–50%

Answer

20–30%

Answer

55–70%

Answer

70–85%

Question 2

A carbon dioxide concentration above what level (ppm) in an occupied space typically indicates inadequate fresh air ventilation?

Accepted Answer

1,000 ppm

Answer

400 ppm

Answer

700 ppm

Answer

2,500 ppm

Question 3

When evaluating IAQ complaints in a building with a central HVAC system, what is the most important first component to inspect?

Accepted Answer

The condensate drain pan and coil for mold growth

Answer

Window seals and weatherstripping

Answer

The thermostat calibration setting

Answer

Return air grille filter for dust buildup only

Question 4

VOCs (volatile organic compounds) in indoor air can contribute to IAQ complaints that mimic mold exposure. Which instrument is used to measure total VOC concentration?

Accepted Answer

PID (photoionization detector)

Answer

Particle counter

Answer

Hygrometer

Answer

Manometer

Question 5

During an IAQ assessment, what does a 'negative building pressure' condition indicate?

Accepted Answer

Outside air and potential contaminants are being drawn into the building

Answer

The HVAC system is working at peak efficiency

Answer

The building has excessive mechanical exhaust

Answer

Indoor CO2 levels are below ambient outdoor concentrations

Question 6

Which condition most directly links an IAQ complaint to a mold source rather than a chemical or particulate source?

Accepted Answer

Symptoms improve when occupants leave the building and return when they re-enter

Answer

Symptoms worsen during winter months only

Answer

Symptoms are limited to eye irritation

Answer

Symptoms include only headaches without respiratory issues