Nanotechnology—opportunities and risks Nanotechnology concerns the manufacture and use of materials on an extremely small scale. Nanomaterials are measured in nanometres (nm) and may be many thousands of times smaller than the breadth of a human hair. One human hair is 80,000 to 100,000 nm thick. At this small scale, materials have different properties compared to the same material in ‘bulk’ form, and this means they can be used in innovative ways, but also may present different risks. Biomedicine, electronics and energy are key sectors currently exploiting nanotechnology, in addition to cosmetics, defence, automotive and agriculture. Uses range from high volume, commodity applications such as carbon black in car tyres, to highly technical low volume uses. Cosmetics regularly use nano titanium dioxide and zinc oxide to provide functionalities, such as UV filtering, and nanoparticles of gold and silver are used in medical diagnostic tools. A 2023 report valued the global nanotechnology market size at US$69.15bn in 2022, with projected growth to US$248.56bn by 2030. The European Commission considers micro/nano—electronics and photonics a Key Enabling Technology, which should