Which factor is least likely to affect fungal growth in indoor spaces?

Fungal growth in indoor spaces is significantly influenced by various factors, and among them, dust accumulation is the least likely to directly affect it. While dust can contribute to the overall environment in which fungi may thrive by providing a surface on which spores can settle, it does not provide the fundamental conditions required for fungal growth.

Nutrients, temperature levels, and building material composition are all critical for fostering the right environment for fungi. Nutrients are necessary for growth and reproduction, while temperature levels influence metabolic rates and reproductive cycles, often favoring fungal expansion in warmer conditions. The composition of building materials can impact moisture retention and availability, which are vital for many fungal species that rely on damp conditions to thrive.

In contrast, while dust may be present in many indoor environments, its accumulation on its own does not supply the moisture, warmth, or nutrients that are needed for fungal spores to grow and develop into mold or other fungal forms. Thus, it’s the least significant factor compared to the others listed.