Dr. Michael Berry, in his book “Protecting the Built Environment: Cleaning for Health,” says that most indoor cleaning problems are related to dirty carpets, but this problem can be solved through maintenance and restoration. Carpets act as a sink to collect pollutants of all kinds from indoors and out, according to Berry. As the sink gets filled up (the carpet gets polluted), it stores more and more dirt, dust and contaminants. When the sink is full, it needs to emptied. If a carpet is not cleaned on a regular basis, it can become a breeding ground for biopollutants, Berry says. It is crucial to regularly empty the sink and make sure that you carpets are cleaned properly. Berry says that the medical community recommends that people remove carpets from buildings and homes, but it is wrong to assume that all carpet will become contaminated and affect people’s health. Rarely do people clean theirs carpets in an effort to protect their health, Berry says, but cleaning carpet regularly can improve indoor air quality. Some of the benefits of extracting pollutants from carpet include: Reducing health problems from loose particles; reducing cases of biologically induced illness, reducing lifetime cancer risks, reducing complaints for building owners and managers, and reducing liability for building owners and managers.