In a response to requests for more research, The WHO has acknowledged that in the case of COVID-19, airborne transmission through respiratory aerosols could not be ruled out in crowded and poorly ventilated settings. When considering risk mitigation as it relates to air filtration, the recommended strategy is to put systems and air filters in place that have a higher likelihood of capturing both droplets and aerosols that exist outside the social distancing zones before the contaminants make contact with healthy people.
Improved Indoor HVAC System Can Help Prevent Airborne Respiratory Viruses
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