H.R. 1268, the "United States Toxic Mold Safety and Protection Act of 2003," has drawn these comments from the American Industrial Hygiene Association:
It's not possible to define or set permissible exposure levels for "toxic mold." The term has originated in the media and has no scientific basis. With the current science, AIHA does not believe it is possible for any single study to ascertain levels of exposure to mold or their products that may be harmful to human health. It's virtually impossible to specify levels at which the many different kinds of mold may be considered "toxic."