Indicator air

Ozone concentrations exceed the limit levels at all measuring stations and thus represent a widespread problem with correspondingly far-reaching consequences. The immissions are connected to the high levels of nitrogen oxide and volatile organic compounds in the air. In Switzerland, as in the majority of central European countries, the immissions of these precursors have decreased significantly in the past few years, as a result of which the limit levels for ozone pollution are also falling. In view of this, the status can be classified as positive. Summer smog can only be combated by massively reducing the precursor pollutants nitrogen oxide and volatile organic compounds at the local, national and international levels, for example by applying the best available technologies to vehicles, industrial and agricultural equipment, and heat generators.

• Related indicators
• Volatile organic compounds emissions

The member states of the EU also measure ozone immissions and calculate similar indicators. The level of ozone pollution in Switzerland is similar to that in its neighbouring countries.

The current status and development of air pollution throughout Switzerland are measured and recorded by the National Air Pollution Monitoring Network (NABEL), which is jointly operated by the FOEN and EMPA (Swiss Federal Laboratories for Materials Science and Technology). It comprises 16 measurement stations distributed throughout the country, which provide data relating to all the most important pollution situations. For the assessment of ozone immissions, data are collected from NABEL stations with permanent measurement cycles.