International Radon Project is a project that helps to measure the amount of a radioactive gas called radon in the environment. Radon is naturally released from rocks and soil and can get into homes, schools and other buildings. Breathing in too much radon can make people sick, so it's important to measure it so that levels can be kept safe. The International Radon Project collects data from different countries around the world, to help scientists understand how much radon there is and how it affects people's health.