I have been getting pretty high VOC readings in my bedroom on a uHoo, Airthings and now even the Dyson HP09 shows some lower levels. So now I am confident there is something being detected. Any advice on how to debug what is causing it and what VOCs it might actually be?

The weird thing is it seems to mostly spike at night time and even more so on the weekends.

I have a few hypothesis, such as: - furniture offgassing - us being in the bedroom - gas cooking in the apartment building somehow settling into our ground floor apartment at night? - it seems to be worse if we have the aircon on - it really only seems to properly dissapate when the windows are open and theres good breeze and there seems to be a correlation between that and the sun coming up?