Results from 10 Dutch mitigation studies (approximately 700 respondents in total) include, apart from an elaborate list of questions about health and comfort responses and building characteristics, data about self reported productivity. The main results are an analysis of the relation of productivity data with health and comfort responses and building characteristics. The general validity of self reported productivity data is discussed on the basis of these results and a literature review. Analysis shows that both negative occupant responses on health and comfort and building characteristics that indicate pollution sources correlate with self reported productivity loss.@en