How Does Mold Affect Indoor Air Quality?

Mold grows by releasing microscopic reproductive cells called spores into the air you breathe. These spores are lightweight and easily travel through your home's ventilation system and living areas. Along with spores, some molds produce volatile organic compounds, or MVOCs, which create that characteristic musty, earthy odor. Both spores and these chemical compounds act as persistent airborne irritants that contaminate your indoor environment, reducing overall air quality.

Mold requires moisture to grow, so any untreated water damage creates a perfect breeding ground. Common sources include leaks from plumbing, roofs, or appliances, as well as flooding and high indoor humidity. Seasonal weather changes, such as extended periods of rain or high humidity, can elevate indoor moisture levels, encouraging mold growth in bathrooms, under sinks, or within wall cavities. Addressing water problems quickly is key to preventing mold from affecting your air.

The most effective step to improve air quality is to find and permanently fix the source of moisture that allows mold to grow. This could mean repairing a leaky pipe, sealing a roof leak, or using a dehumidifier to control high indoor humidity. For existing mold, scrubbing a small, visible area with detergent and water may be sufficient for non-porous surfaces. However, for widespread mold, hidden growth, or contamination in porous materials, a professional mold assessment is needed. Proper cleanup by qualified mold professionals is often necessary to safely remove the source of contamination and restore healthy indoor air.