Air samples are a good way to diagnose a mold source that has not yet been detected. Mold spores are impossible to see with the naked eye, so the sample is sent to a lab and analyzed. The results will reveal whether or not there is mold present in the home and, if there is, will show the severity of the problem.
What areas of the home are air samples normally taken? Obvious places include areas where mold is already visible. Samples would also be taken in areas of moisture intrusion or water damage and anywhere that has a musty odor, which could indicate mold growth.
There are various factors that can affect an air sample reading. Firstly, its best to carry out testing with doors and windows closed and any indoor-outdoor air exchangers switched off. The weather also plays a role, for example, it is not a good idea to take an air sample during severe thunderstorms or extremely high winds as these can affect the accuracy of the test. Air pressure changes can also alter mold spore levels which would change those levels indoors as well.