Abstract
Main text Carbon dioxide (CO 2 ) in nitrogen was one of the first types of gas mixtures performed at an international key comparison. The comparison dates back to 1998 (CCQMK1a) [1]. Since then, many National Metrology Institutes (NMIs) have developed Calibration and Measurement Capabilities (CMCs) for these mixtures. The international comparison of CO 2 at ambient level through CCQM-K52 was compared in 2007 [2]. Recently, NMIs in the APMP region have focused on developing emission standards for regulating CO 2 released by various powered vehicles such as automobiles (motor cars). At the 2017 APMP meeting, several NMIs requested a CO 2 /N 2 comparison to establish their own standards related with automotive regulation, which was to be coordinated by KRISS. Consequently, this comparison provides a CMC for APMP regional NMIs to develop CO 2 /N 2 CMC claim. To reach the main text of this paper, click on Final Report . Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).