A real-time breath-by-breath exposure monitoring system (BBEMS) for measuring inhaled and exhaled breath concentrations has been developed in this research. The BBEMS system is composed from three major components: two small semi-conductor gas sensors to detect organic gases, a modified mask to hold the sensors in the gas pathways, and a tiny but high data capacity datalogger to store the measured numbers. Several laboratory tests were conducted to verify the usability of the system, and several volunteers were asked to help evaluating the performances of the system. In this research, ethanol was used as the target gas to create a non-toxic exposure environment. In simulated human absorption test, the amount of exposure calculated by the BBEMS showed a good agreement with the actual amount measured by the charcoal tubes(r=0.99). In the actual human exposure test, the high correlation(r = 0.86 to 0.96) between the doses measured by the BBEMS and the actual doses indicated that the BBEMS was capable of measuring chemical doses with certain precision. The real time concentration data in exhaled showed that the BBEMS is a good device for those who need to know the concentrations in each exhaled breath.

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