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Objective German MAK value of acetaldehyde has been fixed at 50 ppm to prevent from irritating effects. The threshold value is mainly based on animal experiments. The aim of this study was to evaluate acute effects of an exposure to 50 ppm acetaldehyde on the upper airways of human subjects. Methods Twenty subjects were exposed to 50 ppm acetaldehyde and to air in an exposure chamber for 4 h according...
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