Berlin’s famously clear air is a defining element in the free-spirited attitude to life of its inhabitants. But, unfortunately, the air is suffering at the moment because of high levels of nitrous gas pollution. This and other forms of pollution are measured in Berlin by the city’s air quality monitoring network (in German). In this part of the website, you can find information about nitrous gases. Moreover, there are other noxious substances in Berlin’s air apart from nitrous gases (in German).