When frost comes nipping and the snow falls, the days of popping open a window to get fresh air in are over for another few months. Even when you can get fresh air in periodically, indoor air quality can be questionable, and dust and pollutants build up in homes hunkered down against the cold. In energy-efficient houses with tight envelopes to reduce energy loss, the lack of air exchange affects indoor air quality even more quickly. With these five steps, you can keep your indoor air quality up all winter.

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