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The cold, dry air of winter clearly helps SARS-CoV2 — the virus that causes COVID-19 — spread among people, Yale research has shown. But as humidity increases during spring and summer, the risk of transmission of the virus through airborne particles decreases both outside and indoors in places such as offices.
While viruses can still be transmitted through direct contact or through contaminated surfaces as humidity rises, researchers suggest that, in addition to social distancing and hand washing, the seasonal moderation of relative humidity – the difference between outside humidity and temperatures and indoor humidity – could be an ally in slowing rates of viral transmission.
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