Which surfaces are least likely to harbor mold?

Non-porous surfaces like metal and glass are the least likely to harbor mold due to their smooth and impermeable characteristics. Mold requires moisture and organic material to grow; non-porous surfaces do not provide the organic substrates that molds typically thrive on. They are easier to clean and do not retain moisture as readily as porous materials, making it difficult for mold spores to establish growth.

In contrast, porous materials such as wood, drywall, plaster, carpet, and fabric can absorb moisture and provide a suitable environment for mold proliferation. These materials can trap water and organic debris, serving as a food source for mold spores, thereby increasing the likelihood of mold contamination. Thus, non-porous surfaces present a lower risk for mold development compared to the other options.