Industrial hygienists generally place air-sampling probes on the mid to upper torso of workers when attempting to determine inhaled concentrations. There is no convincing evidence that concentrations measured on the chest are equal to inhaled concentrations. To determine how well surrogate locations matched concentrations at the mouth (C mouth), low concentrations of ethanol in nitrogen were released between the hands of standing and seated human subjects while they moved children's blocks back and forth over the source. I would like to extend my sincere appreciation and deep gratitude to Dr. Steve Guffey for making this accomplishment possible. I would like to thank him for having confidence and faith and willingness to spend all that time with me and giving me the opportunity to work on this project. Through his care and keen efforts, I have passed many difficulties and achieved immensely.
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