Emissions of energy-related ozone precursors (CH4, CO, NMVOC, NOX) have decreased by 43 % between 1990 and 2004 in the EU-25. The largest reductions in emissions occurred in the transport sector (-46 %), largely as a result of the continued introduction of catalytic converters in new vehicles during this period. However, energy production and use remains a significant source for all these pollutants. Reducing energy-related emissions of ozone precursors therefore remains a key priority for reducing local and transboundary air pollution and in ensuring that countries meet their respective emissions ceiling targets of the National Emissions Ceilings Directive and the UNECE Gothenburg Protocol.
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