How do different sectors and processes contribute to emissions of ozone precursors?

Policy Question
Indicator codes: CSI 002 , APE 008

Key messages

(04 Dec 2013)

  • Emissions of the main ground-level ozone precursor pollutants have decreased across the EEA-33 region between 1990 and 2011; nitrogen oxides (NOX) by 44%, non-methane volatile organic compounds (NMVOC) by 57%, carbon monoxide (CO) by 61%, and methane (CH4) by 29%.
  • This decrease has been achieved mainly as a result of the introduction of catalytic converters for vehicles, which has significantly reduced emissions of NOX and CO from the road transport sector, the main source of ozone precursor emissions.
  • The EU-28 as a whole reported 2011 emissions at 4% below the 2010 NECD ceiling for NOX, one of the two ozone precursors (NOX and NMVOC) for which emission limits exist under the EU's NEC Directive (NECD). Total NMVOC emissions in the EU-28 were 22% below the 2010 NECD limit in 2011, however, seven of individual Member States did not meet their ceilings for one or both of these two pollutants.
  • Of the three non-EU countries having emission ceilings for 2010 set under the UNECE/CLRTAP Gothenburg protocol (Liechtenstein, Norway and Switzerland), all reported NMVOC emissions in 2011 that were lower than their respective ceilings, however Liechtenstein and Norway reported 2011 NOX emissions higher than their ceiling for 2010.

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