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Tetrachloroethylene and its degradation products intruded from soil into a building. • Tetrachloroethylene concentrations were overstepping the guidance for indoor air. • Exhaled air concentrations of tetrachloroethylene increased over a work shift. • For the first time biodegradation of tetrachloroethylene were confirmed in human breath. • The body is a 'sampling device' resulting in higher sensitivity compared to environmental methods.