We could all, quite literally, use a breath of fresh air. According to the United States Environmental Protection Agency (EPA), the average American spends approximately 90 percent of their time indoors. OK, so we'd all probably benefit from a little more hiking, bike riding, and outdoor running, but the estimate seems pretty fair for those of us who live in multi-seasonal climates and, you know, work and sleep indoors.
The troubling fact is, based on studies of human exposure to air pollutants by the EPA, indoor levels of pollutants are typically anywhere from two to five times higher than those outdoors. To top it off, indoor air pollutants have been ranked among the top five environmental risks to public health. In addition, kids are even more susceptible to air pollution, since they breathe in a higher volume of air relative to their body weight.
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