A new study from the University of East Anglia and UCL, published in Preventive Medicine, found that air filtration systems and other technologies, such as germicidal lights and ionisers, do not significantly reduce the risk of viral infections in real-world settings like schools and care homes. The researchers reviewed 32 studies conducted before the COVID-19 pandemic and found little evidence supporting the effectiveness of these technologies in preventing respiratory or gastrointestinal infections.
While there has been optimism about air purifiers based on their ability to reduce environmental contamination, this study found weak and potentially biased evidence of their effectiveness. The researchers hope future studies, particularly those conducted during the COVID-19 pandemic, will provide more clarity. The study highlights the need for public health decision-makers to base their choices on comprehensive, unbiased research.