Some of the following interventions are based on COVID-19 Technical Resources published by ASHRAE (a professional organization formerly known as the American Society of Heating, Refrigerating, and Air Conditioning Engineers). However, the overall transmission reduction is less likely to apply to people who are very close (e.g. These interventions are intended to lower transmission risk by lowering the concentration of infectious aerosols in a room. These ventilation interventions can reduce the spread of disease, but they will not eliminate risk completely. Not all interventions will work in all scenarios and their selection must be carefully evaluated prior to adoption. Although it isn’t known exactly how much the concentration of viral particles in air needs to be reduced to start reducing risk of viral infection, ventilation mitigation strategies still provide a reasonable approach to reducing risk. The lower the concentration, the less likely viral particles can be inhaled into the lungs (potentially lowering the inhaled dose) contact eyes, nose, and mouth or fall out of the air to accumulate on surfaces. When indoors, ventilation mitigation strategies can help reduce viral particle concentration.
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