Seven Strategies for Promoting Indoor Air Quality
05 ― Humidify, but not too much. Maintaining indoor relative humidity between 40 and 60 percent may help reduce the viability and transmission of SARS-CoV-2 as well as reduce total particulate matter and volatile organic compounds in the air.¹⁴ Moreover, maintaining relative humidity in this range may provide benefits to the respiratory system’s natural defenses against viral infection. nj For smaller spaces such as administrative offices, portable humidifiers can achieve indoor relative humidity in this range. nj For across the building, regulate indoor humidity by sealing off cracks (where cold, dry air infiltrates) or by installing a whole-building humidification system that is built into the HVAC system. ‒ DO NOT USE this strategy if your building has evidence of condensation or mold growth. High humidity levels can exacerbate this problem and result in subsequent health concerns.
06 ― Clean and disinfect when occupancy is low and the school is well-ventilated.
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