Abstract
Methods and instruments for ensuring unity of measurements of the ozone content in the surface layer of the atmosphere are described. The uncertainty budget of the standard photometric system based on an SRP-type photometer, forming part of the State Primary Standard of the units of molar fraction and mass concentration of the components in gaseous media (GET 154-01) is presented. The results of international key comparisons carried out under the aegis of the BIPM are presented.
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