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In recent years, several different technologies have been considered for use in environmental monitoring and control of spacecraft habitat. These technologies have included monitoring for both water and air. This paper will discuss construction of a trade space for environmental monitoring technologies. Previous trade space metric approaches are reviewed and a new approach is outlined. Trade space considerations include the usual mass, power and volume, along with sensitivity, accuracy, speed of response, frequency of measurement and ease of use. These considerations will be discussed in the context of Constellation program vehicles. In addition to a new approach for trade space construction, this paper will briefly discuss the application of this trade space to a selection of technologies taken from NASA programs, ESA programs, COTS technologies and DoD programs.