Objective and Subjective Responses to Low Relative Humidity in an Office Intervention Study

Love Per Lagercrantz, David Wyon, H. W. Meyer, J. U. Prause, Lei Fang, Geo Clausen, Jan Sundell

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


The impact of dry indoor air on comfort and health in winter was investigated in a crossover intervention study in two floors of an office building in northern Sweden. The indoor air humidity (normally 10-20% RH) was raised to 23-24% RH, one floor at a time, using steam humidifiers. Questionnaires and objective (clinical) measurements were applied. The following effects of increased humidity were significant, though small: the air was evaluated as less dry (though still on the dry side of neutral), eyes smarted less (by 10% of full scale) eye irritation decreased (by 11%), symptoms of dry throat, mouth, lips and skin were reduced, and it was easier to concentrate. The results confirm similar laboratory findings in 5-hour exposures (Fang et al. 2003, reported at this conference) to 2-week field exposures, but as the effects observed were again small, they do not provide sufficient justification for installing humidifiers.
Original languageEnglish
Title of host publicationProceedings of Healthy Buildings 2003
Place of PublicationNational University of Singapore
PublisherStallion Press
Publication date2003
Publication statusPublished - 2003
Event7th International Conference on Healthy Buildings 2003 - Singapore, Singapore
Duration: 7 Dec 200311 Dec 2003
Conference number: 7


Conference7th International Conference on Healthy Buildings 2003
Internet address


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