What is Indoor Air Quality?

Mar 12, 2026

Indoor air quality refers to the cleanliness of the air within and around buildings and structures, specifically as it relates to the health and comfort of the people inside. According to the EPA, people spend approximately 90 percent of their time indoors, where air can be two to five times more polluted than outdoor air.

Key factors that regulate indoor air quality include:

  • Temperature: Maintaining balanced heating and cooling for comfort.
  • Humidity: Managing relative humidity between 30-50 percent to prevent mold growth or dry skin.
  • Ventilation: Circulating fresh outdoor air to dilute and expel indoor contaminants.
  • Contaminants: Monitoring and removing pollutants like dust, pet dander, mold spores, and volatile organic compounds (VOCs).

Maintaining high indoor air quality is essential for reducing allergy symptoms, preventing respiratory issues, and ensuring long-term well-being for occupants.


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