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    Indoor Air Pollution

    Indoor air pollution is a greater risk to our health than outdoor air pollution. The pollution levels indoors can be up to several times higher and people spend much more of their time indoors. Exposure to indoor air pollution can cause common cold-like symptoms that can develop into respiratory diseases over time. One way to greatly improve the indoor air quality of a home is to have the air duct system thoroughly cleaned.

    http://www.greentairductcleaning.com/indoor-air-pollution.php