The International Monitoring System (IMS) spans the globe with a unique network that, when complete, will consist of 321 monitoring stations and 16 laboratories hosted by 89 countries around the world. Around 90 percent of these 337 facilities are already up and running, providing a steady flow of real-time data. The system has already proved its effectiveness, detecting all six of North Korea’s
![IMS Map](https://cdn-ak-scissors.b.st-hatena.com/image/square/fc054e6c4d3892c41e26a13447ec568819301744/height=288;version=1;width=512/https%3A%2F%2Fwww.ctbto.org%2Fsites%2Fdefault%2Ffiles%2FVerificationRegime%2Fradionuclide_map_01.gif)