Our air needs to be clean and healthy. But the question is this, how clean is it really and how are we affecting it? Satellites have brought a painful reality into the open. Human activities (e.g. traffic, heavy industry) are causing alarming amounts of gasses and dust. But by means of agreements laid down internationally, we seek to take air quality to the required standard. With its unprecedentedly detailed view, Tropomi (TROPOspheric Monitoring Instrument) makes perfectly clear how air pollution is caused and whether international agreements indeed pay off. It is how air polluters are displayed, which allows us to see whether countries are observing the existing climate agreements, and warn pilots on time about any erupting volcanoes making flights unsafe.