By use of high-capacity organic vapor collection devices and appropriate sample transfer analysis techniques, combined with psychophysical (sensory) odor evaluations of the gas chromatographically resolved components at the effluent port of a gas chromatograph, it is possible to gather considerable insight into the inventory of the odorous components of an air sample. These procedures were applied to a study of air in several Chicago metropolitan area schools. The outside air was also examined, to permit assessments of the contribution of outside air pollution to the air pollution of the school air by organic vapors and odorants. The gas chromatographic parameters were then inspected, using non-parametric statistics for correlations to the air quality which was first independently ranked using engineering data and on-the-spot observations.