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Harvard Healthy Buildings Program Tool to Determine Target CO₂ Concentrations Indoors
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AUTHORSJoseph Allen, Emily Jones, Sandra Dedesko, Jose Cedeno-Laurent, Anna Young
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ABOUTThis tool supports the Harvard Healthy Building program's "5-Step Guide to Checking Ventilation Rates in Classrooms" and should not be used without reviewing that document first.
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Screenshots of the relevant pages in the "5-Step Guide to Checking Ventilation Rates in Classrooms" are shown below.
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Link to 5-Step Guide to Checking Ventilation Rates in Classrooms
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This tool was developed to support the use of real-time carbon dioxide (CO₂) sensors indoors as a way to help evaluate ventilation rates in classrooms. Users input their target air changes per hour through ventilation and information about the classroom, and the calculator returns the estimated CO₂ concentration. IMPORTANT: sufficient clean air delivery can be achieved through any combination of outdoor air ventilation and filtration, but this tool is only for assessing outdoor air ventilation. It is possible to exceed these target CO₂ concentrations and still be meeting targets for clean air through filtration.
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This guidance does not supercede state or local guidance or guidance from CDC, WHO, or other bodies.
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It is provided to support efforts to understand ventilation rates in indoor spaces.
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To input values from your indoor spaces of interest (yellow cells in the calculation sheet), download the calculator as .xlsx file.
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DATEFebruary 4, 2021
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VERSIONv1.1
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LINK TO FILEhttps://docs.google.com/spreadsheets/d/1wG0dO0Su75iBuUCmY5WpfYtQlTKbQ1UzJOeBVbDxJks/edit?usp=sharing
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SHORT URLhttps://hsph.me/2cr
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 Check back often for updates!
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