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Indoor air quality

Learn how to improve indoor air in homes, businesses, schools, and other places where people gather indoors. Healthy indoor spaces are key to reducing the spread of airborne diseases, including colds, flus, and COVID-19.

Indoor air guidance documents

Learn the three ways to improve indoor air and reduce the risk of spreading airborne diseases and ways to improve indoor air quality at home.

Strategies to improve indoor air quality

Learn about what causes poor indoor air quality, and how filtration and ventilation can help improve indoor air.

Technologies to improve indoor air quality

Learn about different technologies that can help improve indoor air quality, including ultraviolet germicidal irradiation (UVGI), high efficiency particulate air (HEPA) cleaners, and heating, ventilation, and air conditioning (HVAC) systems.

Tips for improving indoor air quality in specific facilities

Learn tips for how to improve indoor air quality in your facility, with specific tips for shared/congregate housing, schools/childcare settings, restaurants, and faith-based organizations.

Additional resources

General information

  • Improving indoor air at home webinar - Information about improving indoor air at home from Public Health – Seattle & King County
  • Indoor air quality - Resources on different sources of indoor air pollution from the Washington State Department of Health
  • Indoor Air Quality- information about how to protect indoor air quality from the Environmental Protection Agency (EPA)
  • Indoor Air Quality Resources – trainings, publications, standards and more about indoor air quality from the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE).

Ventilation in the workplace

Indoor air and airborne illnesses

Clean air campaigns