A lot of the time, we are indoors avoiding the changeable weather. Just as conscious as we are about the weather we should also be concerned about the air we are breathing. And because we become so busy in our everyday lives, we don't think about simple things like air duct cleaning. However, did you know that indoor air is up to 70 times more polluted than the air outside? Think about that. Most people spend between 60 to 90 percent of their time indoors. That is a lot of time spent breathing in dry particles and contaminants.