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Atmospheric monitoring is one of the most important elements in life support aboard U.S. Navy nuclear submarines. The Central Atmosphere Monitoring Systems have reliably served the U.S. Navy by accurately monitoring life gases and contaminants for nearly 30 years. However, as new knowledge of chemical effects on human health increases, the demand for monitoring additional compounds in these closed environments is also increasing. As a result, expanded capability for detecting trace compounds becomes more important and a next-generation monitoring system is warranted. In addition to improved analytical performance, the trend for submarine operation is to increase the degree of distribution and automation to minimize the resources needed for operation and maintenance. It is therefore desirable to incorporate the monitoring instrumentation into the atmosphere control system to provide real-time feedback and automated control.