Get answers to Frequently Asked Questions below about ventilation and safe building practices during and after the COVID-19 pandemic.Building owners and operators can participate in the Clean Air in Building Challenge to improve indoor air quality and protect public health.Implementing multiple building-level mitigation strategies at the same time is consistent with CDC’s layered approach and will increase overall effectiveness of ventilation interventions.The building owner or operator should identify which strategies are appropriate for each building throughout the year. While the mitigation strategies can be universally applied across many indoor environments, applying them to different building types, occupancies, and activities under environmental and seasonal changes can be challenging.Ventilation system upgrades or improvements can increase the delivery of clean air and dilute potential contaminants. Buildings that provided healthy, code-compliant indoor air quality prior to the pandemic can be improved for pandemic and post-pandemic occupancy using less costly interventions.Protective indoor ventilation practices can reduce the airborne viral concentrations and the overall viral exposure to occupants. Indoors, the concentration of viral particles is often higher than outdoors.
Airborne viral particles spread between people more readily indoors than outdoors.An important principle to remember when contemplating mitigation strategies is to “First do no harm.” Building owners and operators should strongly consider seeking expert consultation when considering mitigation strategies if they lack knowledge and experience in implementing those strategies.
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