It should be noted that currently no Federal or State of Michigan regulations, or exposure limits, exist for mold in commercial buildings or private residences. In the absence of such regulations, industry standards are utilized, which generally compare the levels of mold indoors with the outdoor levels of mold at the time of sampling. Ideally, the surface samples taken from inside a building should reflect no more than trace or light levels of mold. Airborne concentrations should be a fraction of exterior levels. Visible mold growth inside a building is not acceptable. If mold can be seen or smelled inside of a building remediation should be performed to identify and eliminate sources of moisture and to clean up and remove the mold and affected building materials. Please refer to Online Information Sources on this website for published information provided by the U.S. Environmental Protection Agency and other governmental sources. Gulf-coast states like Florida and Texas, for example, have rules and regulations regulating mold. Michigan will likely never have these rules.