May 20, World Metrology Day, is the day when the anniversary of the signing of the Meter Convention in 1875 is celebrated. The Meter Convention provides the foundation for a coherent measurement system worldwide, which underpins scientific discoveries and innovations, industrial production, international trade, as well as the improvement of quality of life and environmental protection at a global level.

This year, on May 20 - World Metrology Day, we celebrate under the theme: "Measurements Supporting the Global Food System." This theme has been chosen due to the increasing challenges of climate change and global food distribution.

The impact of metrology on the global food system is evident in the following ways:

• The quantity of purchased and sold food is measured by its mass or volume. The range of these measurements extends from large quantities traded on a global scale to nominal quantities of pre-packaged products intended for end consumers.
• Efficient storage and packaging of food depend on accurately measured values of temperature and humidity in the storage environment.
• The quality and authenticity of food are determined by measuring its chemical composition. This includes measurements that ensure the food contains the stated values, such as proteins indicated on the label, to measurements of its isotopic composition.
• Food safety is ensured through measurements of chemical contamination, such as pesticide residues and heavy metals, or biological contamination, such as mycotoxins.

World Metrology Day recognizes and celebrates the contribution of all people worldwide working in intergovernmental and national organizations involved in metrology for the benefit of all.