The State Administration for Market Regulation recently organized China's scientific and technological forces to carry out key technical research on ozone standard gas, successfully breaking through the limit of stable ozone generation, and ending the situation where ozone gas quantity values could only be traced back to the National Institute of Standards and Technology (NIST) in the United States for a long time.

This research achieved, for the first time in China, a generation concentration range of (100—1000)×10⁻⁹ mol/mol for ozone standard gas, with a standard uncertainty better than 1% and stability better than 1.0%/7d. The research team also developed multiple achievements including an ozone primary standard reference photometer device and a zero-air source generation module, which can be applied to the metrological detection of ozone standard gas and the entire ozone monitoring process.

On this basis, the research team led the drafting and revision of the national standard "Ozone Calibration Analyzer," providing technical support from methods to standards for improving the performance of ozone monitoring equipment, and establishing an ozone quantity dissemination system of "international equivalence—quantity value source—transfer standard—monitoring data". The establishment of this system ensures the consistency, accuracy, and reliability of national ozone standard gas monitoring data.

Currently, relevant units are relying on the above achievements to carry out national metrological comparison work for ambient air ozone standard reference photometers, providing technical support for the iteration of ozone detection technology and the improvement of monitoring data quality.