Ozon - Die Landwirtschaft im Zwiespalt?
1995
Staffelbach Th. | Neftel A.
Ozone is a toxic gas which is produced by photochemical oxidation of nitrogen oxides and volatile organic carbons. Fertilised agricultural areas emit nitrogen monoxide and have a potential to contribute to ozone production. The goal for research is to understand ozone formation and to assess the importance of the various sources of precursors. This is achieved by combining field measurements and modelling. The Swiss project POLLUMET shows that for most parts of Switzerland availability of nitrogen oxides is the limiting factor for ozone production. Therefore, the reduction of nitrogen oxide emissions is an effective tool to reduce ozone concentrations. Agricultural emissions are about 5 % of the total annual emissions and can reach up to 25 % on the Swiss Plateau during summer. The reduction of emissions from agriculture is only possible by avoiding over-fertilisation, the potential for an effective reduction of nitrogen oxide emissions being, however, much lower than for other sources.
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