[dementik]

Afaik there are no simple sensors for this but havong gone through probably similar situation here, few things what I have learned: - voc sensor can detect lots of stuff, but reports just total value, still, voc sensor can be good way to detect if there is something wrong - our local laboratories have test sets which can be ordered home. Those cost something like 200eur, are placed e.g. on the table for an hour and those collect air. Then the unit is sent to laboratory which will report total voc (good to get a clue how right your own sensor is) and also detailed info on chemicals. For moulds there are different test sets - if some material is suspected to emit something, they can also identify material tvoc and detailed chemicals (so if there is some "bad" chemical on air sample, this is usually to confirm the source)