There have been cases in the cleaning industry where congestion in breathing was caused by dirty carpets. Of course, there are many products out there that can effectively clean your carpets, but are they safe for your health and the environment? The only way to have peace of mind is by using products that do not contain harmful VOC's, and are rated health hazard 1 or lower. Bio-Kleen makes a great product. You should always ask plenty of questions if you have service professionals cleaning your place of business or home.