Our evaluation of the indoor air quality (IAQ) is performed to ensure that breathing the ambient air poses a negligible health risk to the occupants.  As well, to ensure the ambient air may be perceived as fresh & pleasant opposed to stale, stuffy or irritating.  Our approach when possible is to limit our assessment to the nuisance compound(s).  We would prefer and often request as much input from the Client to ensure we are evaluating and sampling the correct chemical(s).