How does high humidity affect indoor air quality (IAQ)?

High humidity significantly impacts indoor air quality by promoting mold growth. When the humidity levels in an indoor environment rise above 60%, it creates ideal conditions for mold spores to flourish. Mold thrives in damp environments and can develop on a variety of surfaces, including walls, ceilings, and furnishings. This not only leads to structural issues within a building but also poses serious health risks to occupants, as mold can release allergens and irritants that contribute to respiratory problems and other health issues.

Maintaining an optimal humidity level, typically between 30% and 50%, is crucial for preventing both mold growth and its associated health hazards.

On the other hand, decreased dust levels and improved ventilation would typically require a controlled environment with appropriate humidity levels, and high humidity might hinder ventilation effectiveness. Similarly, the claim that high humidity has no impact contradicts extensive research indicating its significant role in air quality and occupant health.