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As winter approaches and people spend more time indoors, a quiet device is earning renewed attention: the humble humidifier. While air purifiers dominate conversations about healthy homes, researchers say controlling indoor humidity may be just as crucial in reducing the spread of respiratory viruses, from common colds and influenza to RSV and coronaviruses.

When indoor air turns too dry — typically below 30 percent relative humidity, virus-carrying droplets evaporate quickly and stay suspended longer, increasing the risk of inhalation. But at optimal humidity levels, between 35 and 50 percent, the same droplets become heavier and fall out of the air faster. It’s like draping the atmosphere in a soft, invisible blanket that gently pushes viruses to the ground inst

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