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I don’t know whether one person has had an operation, has had steroids, is on immunosuppressants, if they’re a smoker or not. ‘Every room is different and every human is different. However Dr Navapurkar stresses that further testing needs to be carried out, as there are many variables that could impact the effectiveness of an air purifier on a hospital ward. This is an exciting development, which could allow hospitals to better manage airborne transmission of Covid-19 between patients and staff on the surge wards, with relatively inexpensive air purification machines, especially during peaks. It’s the science of measuring the air that’s key here.’ We can measure how much is there in that proportion of air that’s breathable into the lungs that triggers injury. Intensive care consultant at Addenbrooke’s Hospital Dr Vilas Navapurkar, who led the study, told us: ‘We can remove SARS-CoV-2 and other infecting potential organisms from the air. The air purifiers also successfully filtered out other bacterial, fungal and viral bioaerosols (airborne particles containing living organisms). In November 2021, a research team at Addenbrooke’s Hospital and the University of Cambridge reported that they were able to use HEPA filter/UV steriliser air purifiers to remove most airborne traces of SARS-CoV-2 on surge wards at the hospital.
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Research on using air filter machines on Covid-19 wards It also said these models were ‘not proven to kill SARS-CoV-2 or reduce or prevent Covid-19 transmission’.
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In April 2021, Blueair updated its website to say that it had now tested the ability of its HealthProtect 7400 series to remove live coronavirus particles from the air and that its results showed 99.99% of the live SARS-CoV-2 virus in its test were removed from the air. We have posted the information you refer to on our website in response to the many questions (including questions about particle sizes) that have been flooding in from all over the world – from consumers, hospitals and media – asking specifically about air purifiers and coronavirus.’ We have also stated very clearly that Blueair has not tested against the new coronavirus. ‘We have made it absolutely clear on our website that an air purifier will not protect you from coronavirus. We reached out to Blueair for comment in March 2020. Corona viruses measure about 0.12 micron.’īlueair air purifiers are often highly rated by Which?, but we are in no way saying that these products (or any commercial air purifiers) protect you from coronavirus. This includes any viruses with a particle size of at least 0.1 micron. ‘Blueair’s HEPASilent™ technology captures at least 99.97% of airborne particles down to 0.1 microns in size. The tests included H1N1 influenza, staphylococcus aureus, E coli and aspergillus. ‘However, here is what we do know: Blueair air purifiers have been third-party tested for the removal of the most common viruses and bacteria with a clearance rate of more than 99.99%. ‘Blueair air purifiers have not been tested for the removal of coronavirus yet, as it’s a new strain that was discovered in 2019.
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In March 2020, air purifier manufacturer Blueair’s website stated: But there is a risk that such advertising gives false hope and could act as a distraction from official government advice. And you could argue that, even if these products don’t work as well as claimed, there’s no harm in buying one. These manufacturers only ship to Canada and the US, so their products aren’t available in the UK. You can also read the latest coronavirus news and advice from Which?Īir purifiers for coronavirus: do they exist?Īt the start of the pandemic, some air purifier manufacturers implied, or outright claimed, that their machines would protect you from coronavirus.Įxamples of manufacturers making direct claims about this include AllerAir (below, spotted on 25 March 2020)īy 25 March 2020, the Airpura website had been adjusted to say ‘how an air purifier can kill airborne viruses’ rather than ‘how an air purifier can kill airborne viruses, such as coronavirus’. Just want to see which air purifiers that impressed in our tests? See our list of Best Buy air purifiers.
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Read on to find out why that’s the case, how air purifiers can potentially help improve your air quality in other ways, and free ways you can breathe cleaner air at home. But you shouldn’t solely rely on an air purifier to filter out the virus in your home. Recent studies have indicated that air purifiers can reduce traces of airborne Covid-19 on hospital wards. We saw a spike in online traffic for air purifiers at the start of the pandemic as worried people were, understandably, looking for products to help prevent them getting Covid-19.