Indoor Air sciences CSMI Practice Exam

Which air quality issue is primarily associated with mold proliferation?

1. Ozone depletion

2. Indoor humidity

3. Carbon monoxide levels

4. Airborne particulate matter

The correct answer is: Indoor humidity

Mold proliferation is primarily linked to indoor humidity levels because mold thrives in moist environments. When relative humidity exceeds a certain threshold, typically around 60%, it creates an ideal condition for mold spores to germinate and grow. High humidity can arise from various sources, such as water leaks, inadequate ventilation, and insufficient heating, which can lead to the accumulation of moisture on surfaces. While ozone depletion, carbon monoxide levels, and airborne particulate matter are significant air quality concerns, they do not directly facilitate the growth of mold. Ozone depletion pertains to the thinning of the Earth's ozone layer, which affects outdoor air quality but is not related to indoor mold growth. Carbon monoxide is a toxic gas produced by incomplete combustion of fuels, and while it poses serious health risks, it does not cause mold to proliferate. Airborne particulate matter refers to tiny particles in the air that can have various sources and health effects, but they do not provide the necessary conditions for mold growth like high humidity does. Thus, the relationship between indoor humidity and mold development is critical, as controlling humidity levels is one of the primary strategies for preventing mold proliferation and ensuring better indoor air quality.