BIPM.QM-K1 (NMISA 2023): Ozone at ambient level

As part of the ongoing key comparison BIPM.QM-K1, a 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 .