Counting Nanoparticles: Global Regulatory Challenges

In a recent article published in Nature Nanotechnology, researchers Kirsten Rasmussen, Juan Riego Sintes, and Hubert Rauscher delve into the complexities of defining nanomaterials from a global regulatory perspective. The legal classification of nanomaterials varies across different countries, leading to inconsistencies in how the same material is categorized. To address this, the authors propose steps toward achieving an international consensus on nanomaterial definitions and particle counting methods. Nanomaterials, generally characterized by features between 1 and 100 nanometers, pose unique safety concerns. Establishing consistent definitions is crucial for setting effective regulatory requirements. The article examines differences in nanomaterial definitions across various jurisdictions and explores pathways for achieving global convergence.

Key Points:

(*) Nanomaterial definitions differ worldwide, impacting legal classification.

(*) A global effort is underway to harmonize definitions and counting methods.

(*) Legislators’ country-specific definitions can lead to varying categorizations.

(*) Consistent definitions are essential for data requirements and safety regulations.

(*) The study highlights differences across OECD member countries, the EU, and other relevant economies.

Link to Rasmussen, K., Sintes, J. R., & Rauscher, H. (2024). How nanoparticles are counted in global regulatory nanomaterial definitions. Nature Nanotechnology, 19(2), 132–138. DOI: 10.1038/s41565-023-01578-x