In the case of exceedances of air pollution threshold values a so-called identification of the status quo has to be carried out, which investigated into the framework conditions and causes of the exceedance. The main law on the protection of the air that we breathe the Air Pollution Control Act ( Immissionsschutzgesetz-Luft IG-L) was adopted, after several years of negotiations between all interest groups, in 1997. In spite of the progress achieved in the motor vehicle exhaust gas technology, the threshold values next to roads are still exceeded nowadays due to the permanently rising traffic volume. In order to achieve a considerable reduction of particulate matter, a great number of measures, in the transport sector, as well as in the fields of trade and industry and domestic heating is required.Īs far as nitrogen oxides are concerned the need for reduction has also been a topic, as they are also ozone precursor substances. For his reason more rigid limit values were adopted a few years ago.
New scientific evidence and new measurement methods have raised awareness for the problem of particulate matter. Since then a lot could already be achieved with some pollutants, such as a reduction of SO2 and of lead emissions by more than 90%, of emissions of dioxins and of polycyclical, aromatic hydrocarbons by more than 80%. In the 1980s the topic of “clean air” gained in significance due to dying forests and the dioxin problem.
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