What factors are necessary for mold growth to occur?

Mold growth is fundamentally dependent on the presence of moisture, which is encapsulated in the need for a water source. Mold spores, which are ubiquitous in the environment, require water to germinate and proliferate. Without adequate moisture, whether from high humidity, water leaks, or flooding, mold cannot thrive.

While there are other factors that can influence mold growth, such as temperature and air circulation, moisture remains the primary and most critical requirement. Humidity levels of around 60% or higher can provide an environment conducive to mold growth. Other conditions, such as appropriate temperatures (usually between 32°F to 120°F) and organic materials to serve as food sources, contribute to the rate of growth but are secondary to the necessity of water.

The options related to air circulation and soil presence, although they can affect mold development in certain situations, do not hold the same level of criticality as having an adequate water source. Hence, identifying moisture as the key factor aligns with the fundamental principles in microbial remediation.