The goal of the industrial hygienist is to keep workers, their families, and the community healthy and safe. They play a vital part in ensuring that federal, state, and local laws and regulations are followed in the work environment.
In general, when it comes to any kind of air sampling for mold, there area few things the IH has to take into consideration. First of which, mold is everywhere. So let's say Mrs. Smith calls an IH into her home because she thinks she has a mold issue. The IH will perform a visual inspection. He/She will also use his/her meters to find out if there is any wet building materials because that is the main ingredient for mold growth. The IH will then take air samples in the area in question. The number of air samples taken in a given area varies depending on size, occupants, and conditions. The IH will then take an air sample from the outside environment. Again, the number of samples may vary depending upon size of building, occupants, and conditions to name a few. They take a sample from the outside air and use those levels as a base line to compare it against the levels found in the indoor environment.
In a perfect world, the interior sample levels should be at or below the exterior samples. So let us say for example, the total outside spore counts are 500. The levels inside should be about the same. There are some situations where the total spore count of the exterior baseline sample is higher than the total spore count of the interior samples but there is a species of mold that is higher in concentration inside than outside. That shows that there might be an issue that needs to be addressed and further inspection would be necessary if the source is not found. The IH also does not want to find a species of mold in the indoor environment that is not found in the exterior base line sample(s). That is usually indicative of an issue as well.
The IH will then take all this information gathered through an inspection, sampling, and interviews of occupants and write a mold remediation protocol for his client. The protocol contains in writing the environmental controls and recommended scope of work necessary to bring the interior air quality to acceptable levels. The client then gives that written protocol to prospective remediation companies so they can provide estimates for the work that needs to be done. A professional remediation company MUST abide by the written protocol. If during the course of the project, the contractor uncovers something that was not in the protocol, work should stop until verbal confirmation is obtained by the IH and all interested parties are notified and everyone is satisfied about plan of action.