The best mold tests are NOT air tests. Of course most “professionals” will tell you air tests are great, because that’s all they know. But it’s old technology.
The problem with air testing is that you’re only testing at one point in time. Depending on wind, ventilation, air flow, etc, you may get lucky and catch the spores, or you may not.
Over time, mold spores will gradually settle out of the air, and get added to dust. So the best method, recommended by the EPA, is to collect dust and do a DNA analysis on it. This is called an ERMI test. Mycometrics is the best company for this test. They will send you a test kit which is basically a Swiffer and a plastic bag.
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