Exceeding the Limit Values
Especially diesel vehicles without a suitable exhaust gas purification system bear the responsibility for air pollution. As it has been known for several years, the nitrogen oxide pollution of German town centres does not correspond to legal requirements. The problem with nitrogen oxide (NO2) in Germany is preliminarily attributed to the traffic in town centres.
According to statements of the Federal Environment Agency about air quality (status of August 2014), more than half of the measuring stations in metropolitan areas found levels of nitrogen oxide lying above the admissible limit of 40 µg/m³ during the annual average of 2013.