Which action is most effective in reducing mold growth in a house?

Reducing mold growth in a house is best achieved through specific methods that target moisture management, as mold thrives in damp conditions. Covering earthen floors and open water surfaces helps to eliminate sources of moisture that can promote mold growth. When these surfaces are covered, it minimizes evaporation of water, which reduces the humidity levels in the vicinity and thus slows down or prevents mold spores from thriving.

While various other strategies might contribute to mold prevention, they do not address the root cause as effectively as this method does. Reducing relative humidity to a very low level, such as 10%, may not be practical or attainable in many typical household situations. Conversely, increasing humidity to 80% would create excessively moist conditions, likely facilitating rather than hindering mold growth. Air filtration can improve air quality and remove particulates, but it does not directly address the necessary moisture control required to minimize mold. Therefore, covering vulnerable areas where moisture accumulates is a targeted and effective approach in mold prevention.