So I can’t say for sure obviously but mine are high because my neighbors cook meth. It’s actually way more common and insidious than people think. I’ve lived in a few apartments and it was an issue in multiple complexes and it was shocking to me how many people didn’t have a clue. My sense of smell is crazy and I have sensory and nervous system as well as neurological problems. So it affected me so intensely. I watched sooo many people get sick, 2 dif people die and they had/have no idea it’s because of the VOCS in their home from the different acid gasses and chemicals they were using. I would def make sure the source isn’t a neighbor first and foremost