Further benefits will be achieved if the emission reductions are large enough to result

in decreased ozone formation. Since the effect of reductions may vary from one part

of Europe to another, due to chemical characteristics of the local atmosphere, it is

difficult to find optimal abatement strategies. Quantification of the effect on ozone

formation in different areas as a consequence of various reduction scenarios is studied

within the EMEP modelling activities as a basis for the new NOx protocol.


Finally, abatement strategies, chosen with the aim of reducing NO2 concentrations in

ambient air, may be performed with techniques that lead to reduction of other air

pollutants and, in this way, also to reduction of other environmental effects. Such

additional effects may, however, be difficult to quantify, unless the techniques for

reduction are known in detail.


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