 It also covers pet management and natural living advice. Purchase the organic manual in bookstores everywhere. Also available in independent garden centers, nurseries, hardware, and other fine stores. Go to DirtDoctor.com to purchase or to find a store near you. It's common for the air inside a home or office to be more toxic than the air outside. That's because of toxic materials that outgas and the fact that homes and buildings are better sealed and insulated than ever before.