It contributes to the poisoning of lakes and subsoil water with mercury and aluminum. It raises the acidity of the soil to the point where the forests die, and overly fertilize coastal waters.
Pollution is no respecter of political borders.
No matter what a country does to its environment, it still receives a lot of the airborne and waterborne pollution from its neighbors. An important goal for every country is thus to reduce the air pollution at the source. This is best tackled by an effort to, on an international basis, co-operate to promote beamtraffic systems in the big urban areas, where the need is most urgent. This would create a market for beam traffic components that does not have to be protected with custom duties, subsidies and import restriktions, as is the case with the European car industry at the present. One could use levies for entering various zones to counteract traffic congestion in certain areas.