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We should install air purifiers with HEPA filters in every classroom. It could help with COVID, bushfire smoke and asthma
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Hong Kong start-up Aurabeat's lab-tested purifier rids the air of 99.9 per cent of Covid-19 viruses. Is it enough for the real world? | South China Morning Post
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Air filter significantly reduces presence of airborne SARS-CoV-2 in COVID-19 wards | University of Cambridge
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Physicist, Non-Profits Build and Test Air Purifiers That Remove COVID Particles | University of Arkansas
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