I thought this was the problem a while back and did the petri dish. I did one in a place I couldn't breathe and I did one in the living room where I could and they both had mold. So the test wasn't very effective because there could be more in the bad area and the test doesn't really show how much. I don't know though, it doesn't smell like mold, and why would 90% of areas in the south not be breathable for me, including outside most days?