Johnson Matthey Plc engages in the manufacture of measuring devices. It operates through the following segments: Clean Air, Efficient Natural Resources, Health, New Markets, and Corporate. The Clean Air segment focuses on catalysts and catalyst systems to reduce emissions from vehicles and industry. The Efficient Natural Resources segment creates value from efficient use and transformation of critical natural resources including oil, gas, biomass, and platinum group metals (pgms). The Health segment offers solutions to the complex problems of both generic, and innovator companies. The New Markets segment covers new areas of potential growth aligned to global priorities of cleaner air, improved health, and more efficient use of natural resources. The company was founded by Percival Norton Johnson in 1817 and is headquartered in London, the United Kingdom.