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 reagarding Indoor Air Quality (IAQ) are followed in the work environment.
In general, when it comes to any kind of mold testing, there area few things the IH has to take into consideration. First of which, mold spores are everywhere. So let's say Mrs. Smith calls an IH home inspection because she thinks she has indoor air quality issues. The IH will perform a visual inspection. He/She will also use his/her moisture meters to find out if there is any wet building materials because that moisture from water damage is the main ingredient for mold growth. If the IH finds any visible mold or water damage issues the IH will then perform mold testing by taking air samples in the area(s) in question.
The number of air samples taken in a given area is at the discretion of the IH. It varies depending on size, occupants, and conditions in and around the area in question. The IH will then take an air sample(s) from the outside environment and unaffected areas of the structure. 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 a known unaffected area(s) to use those levels as a base line to compare it against the levels found in the affected 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 mold spore counts are 500. The levels inside should be at or below those baseline sample(s). There are some situations where the total spore count of the baseline sample is higher than the total spore count of the affected area samples and still have an issue that requires mold remediation. One example of this is if there is a species of mold spore(s) that is higher in individual concentration inside than in the baseline samples. Another reason would be if the IH also finds a species of mold spore(s) in the indoor environment that is not found in the baseline sample(s). Both examples would require some type of a mold remediation and/or air scrubbing to remediate the indoor air quality issue due to the mold spores.
The Industrial Hygienist will then take all thie information gathered through an inspection, sampling, and interviews of occupants and write a mold remediation protocol for their client. The mold remediation protocol contains in writing the egineering controls and recommended scope of work necessary to bring the interior air quality to within acceptable levels.
The client then gives that written protocol to a qualified mold remediation companies so they can provide a written estimate for the work that needs to be done. A professional mold remediation company MUST abide by the IH's written protocol. If during the course of the project, the mold remediation contractor uncovers something that was not in the IH's 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.