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The exhaled air and volatile emission by the skin of human subjects were analyzed for traces of ethene (C 2 H 4 ) by means of CO 2 laser photoacoustic trace gas detection. Due to the extreme sensitivity of the detection system ͑6 part per trillion volume, 6:10 12 ), these measurements could be performed on-line and noninvasively. Exhaled ethene was used as a biomarker for lipid peroxidation in the skin of human subjects exposed to ultraviolet ͑UV͒ radiation from a solarium. A change in the ethene concentration was already observed in the exhaled air after 2 min. Adaptation of the skin to UV exposure and direct skin emission could also be observed.

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