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Acknowledgment in Memorium. This paper is dedicated to Ernie Hughes, who pioneered the scientific development of the NIST gas SRM program, and who contributed so much of his technical knowledge to numerous interactions with experts in the gas analysis field, worldwide. In the present study, Ernie carried out the analyses of the NPL standards and supplied the SRMs that were analyzed by NPL, but passed away before this paper could be written. His unique insight into the requirements for accuracy in gas standards and trace gas analysis will be sorely missed by his many friends and scientific colleagues both in the United States and abroad.Registry No. CO, C02, Literature Cited(1) Davenport, A. J.; Freshwater, F.; King, J. H.; Merrifield, D. R.; Partridge, R. H.; Woods, P. T. NPL Quantum Metrology Report: Analyses of Reference Gas Mixtures for the Community Bureau of Reference, Commission of European Communities; January 1985.