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The best humidifier: Fight dry air (and a dry nose) all winter long PopSci Commerce Team © Provided by Popular Science Here are some of the most important things to consider when looking for a new humidifier. The Environmental Protection Agency recommends that indoor air humidity levels are kept between 30 and 50 percent for optimal health. Dry air, whether indoor or outdoor, is a recipe for a host of potential inconveniences including dry skin, irritated eyes, and overall de...