CIPM MRA COMPARISON REPORTS
BIPM.QM-K1 (NMISA 2023)
Ozone at ambient level
Published on 26/02/2026 - © 2026 J. Viallon et al
Citation J. Viallon et al 2026 CIPM MRA Comparison reports 08012
Authors
Joële Viallon Bureau International des Poids et Mesures (BIPM) 
Philippe Moussay Bureau International des Poids et Mesures (BIPM)
Faraz Idrees Bureau International des Poids et Mesures (BIPM)
Robert Wielgosz Bureau International des Poids et Mesures (BIPM)
Jim Norris National Institute for Standards and Technology (NIST) United States of America
Peter Trask National Institute for Standards and Technology (NIST) United States of America
Tshepiso Mphamo National Metrology Institute of South Africa (NMISA) South Africa
Mphara Mogale National Metrology Institute of South Africa (NMISA) South Africa
Abstract
As part of the ongoing key comparison BIPM.QM-K1, comparison has been performed between the ozone standard of South Africa maintained by the National Metrology Institute of South Africa (NMISA) and the common reference standard of the key comparison, maintained by the Bureau International des Poids et Mesures (BIPM). The instruments have been compared over a nominal ozone amount fraction range of 0 nmol mol−1 to 500 nmol mol−1.