Prof Mark Jermy, Dr Julie Bennett, Dr Jason Chen, Phoebe Taptiklis and Dr Caroline Shorter*
Indoor environments increase the risk of transmission for the virus that causes Covid-19 (SARS-CoV-2) by containment and concentration of the airborne virus. However, to reduce such transmission, the particles that carry the virus can be diluted by bringing in as much outdoor air as possible. When good ventilation is not possible, air purifiers can be used as an additional preventative measure to reduce the number of virus-laden particles. Ventilation and purification of indoor air needs to be used alongside public health measures, such as vaccination, staying home when unwell and mask use. This blog outlines some basic principles of using air purifiers to reduce the risk of Covid-19 transmission.