For the first time, China has successfully developed a reference material that meets the high-precision requirements for ambient air carbon monitoring

Reference materials are indispensable "scales" and "weights" for carrying out chemical, biological and other testing activities, and are an important national measurement strategic resource. Recently, China's State Administration for Market Regulation approved the construction of new national first-level standard materials for carbon dioxide and methane greenhouse gases in synthetic air, becoming China's first batch of standard materials to meet the high-precision requirements for ambient air carbon monitoring, providing strong support for high-precision and accurate measurement of the greenhouse gas carbon dioxide and methane content in China's ambient air.

Carbon dioxide and methane are two major greenhouse gases produced by human activities. Greenhouse gas monitoring is the basis for studying the changing trend of greenhouse gas concentration. It is also the basis for evaluating the greenhouse effect and the yardstick for specifying emission reduction measures. The average annual change rates of carbon dioxide and methane concentrations in the global atmosphere are only 0.6% and 0.4%. In order to accurately reflect small changes in greenhouse gas concentrations, high-precision standard materials must be used to ensure monitoring results at different times and in different spaces during the long-term monitoring process. Accuracy and comparability.

China's first successful development of carbon dioxide and methane greenhouse gas standard materials in synthetic air has an accuracy of 0.05%(equivalent to the change in carbon dioxide concentration caused by an adult breathing in a room of 30 square meters) and 0.1%. The successful development of a national-level standard material for high-precision carbon monitoring provides a technical basis for accurate comparability and international equivalence of greenhouse gas monitoring data, effectively promotes the localized research and development and promotion of greenhouse gas monitoring technologies and instruments, and embodies the "carbon peak and carbon neutrality" technical foundation role.

In the next step, the State Administration for Market Regulation will strengthen the research and development and application of carbon monitoring related standard material technologies, accelerate the transformation of high-level standard material scientific and technological achievements into measurement capabilities, and further enhance the source unity and magnitude consistency of China's greenhouse gas monitoring "metrology". Carbon emission monitoring provides a "precise yardstick".