Environmental effects of reactive nitrogen (Nr) are a result of intense anthropogenic activities.1 Thy are evident in different parts of the world. Proper treatment is, inter alia, a scale issue. With individual countries in mostof Europe too small for comprehensive coverage of all effects, regulation of pollution in Europe co-emerged with political inegration in general. In this article, we describe the most important frameworks of international regulation in Europe. We als discuss the interaction of such institutional setting with the scientific initiatives at the samelevel, and finaly assess how scientific results have been fed with some success into strategies to mitigate pollution levels
