Cars on Neckartor Street in Stuttgart.
A new Greenpeace study shows that air pollution in German cities is more problematic than previously known. High levels of nitrogen oxide in several cities have been measured, which is mainly caused by diesel motors. Neckartor is one of Germany's busiest roads. 

Verkehr auf der Strasse Neckartor in Stuttgart, eine der schmutzigsten Strassen Deutschlands in Bezug auf Luftschadstoffe wie Feinstaub oder Stickoxid. Vor allem Dieselfahrzeuge tragen zu dieser Belastung bei.