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Indicator Assessment
Emission trends of nitrogen oxides (EEA member countries, EU-27 Member States)
Distance-to-target for EEA member countries
Note: Data are for NOx emissions. The 'distance to target' results are shown in green (countries need to do more to be on track to meet their ceiling in 2010) and purple (countries are on track to meet their ceiling in 2010).
EEA aggregated and gap-filled air emission dataset, based on 2009 officially reported national total and sectoral emissions to UNECE LRTAP Convention, the EU NEC Directive and EU-MM/UNFCCC.
EEA-32 NOx emissions have decreased by 31% between 1990 and 2007. The majority of EEA-32 countries have reported lower emissions of NOx in 2007 compared to 1990. The exceptions to this are Austria (+14% increase between 1990 and 2007), Cyprus (+24%), Greece (+25%), Malta (20%), Portugal (+2%), Spain (+20%) and Turkey (85%).
In general, the newer Member States of the European Union have made substantially better progress towards meeting their respective NOx ceilings than the older EU-15 Member States. Eleven of the twelve post-2004 Member States have already reduced emissions beyond what is required under the NECD, or are very close to doing so (Bulgaria, Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia and Slovenia). In contrast, only one EU-15 Member State (Portugal) has emissions within its respective national ceiling.
Many Member States are not considered to be on track towards meeting their obligations under the NECD. In particular Austria, Spain, Ireland, Malta, France, Belgium and Greece must still make significant cuts to NOx emissions in the immediate coming years if they are to meet their obligations under the NECD. Emissions have actually increased in Austria (+14%), Cyprus (+24%), Greece (+25%), Malta (20%), Portugal (+2%) and Spain (+20%) during the period 1990 to 2007, despite all countries having obligations to reduce emissions under the NECD and Gothenburg Protocol.
The EFTA-4 (Iceland, Liechtenstein, Norway and Switzerland) and CC-3 (Croatia, FYR of Macedonia and Turkey) countries are not members of the European Union and hence have no emission ceilings set under the NECD. However, Switzerland and Norway have ratified the Gothenburg Protocol, requiring them to reduce their emissions to the agreed ceiling specified in the protocol by 2010. Switzerland is close to meeting its Gothenburg Protocol ceiling, whilst Norway, which has not yet met its national ceiling still must make a significant reduction to NOx emissions.
Reductions of NOx have occurred in all economic sectors. The three sectors responsible for the vast majority of the decline in NOx emissions are 'road transport' (contributing 46% of the total reduction in NOx emissions reported by countries), 'energy industries' (contributing 28%), and 'industry (energy)' (contributing 9%).
Significant reductions have occurred in the 'road transport' sector since the early 1990s (36% reduction between 1990 and 2007). This has been achieved despite the general increase in activity within this sector over the period. The emission reductions have primarily been achieved as a result of fitting catalysts to vehicles (driven by the legislative 'Euro' standards). However, across Europe there is also an increasing awareness of the contribution made to NOx pollutant emissions by national and international ship traffic (a more detailed discussion of this issue is contained in the TERM indicator fact sheet TERM03 - Transport emissions of air pollutants).
Emissions of NOx have also declined in the 'energy industries' (21% reduction between 1990 and 2007). In the electricity/energy production sector this has been achieved through the implementation of measures such as combustion modification, introduction of flue-gas abatement techniques and a fuel-switching from coal to gas. One of the most common forms of combustion modification is to use low NOx burners, which typically can reduce NOx emissions by up to 40%. Flue gas treatment techniques (e.g. NOx scrubbers and selective (SCR) and selective non-catalytic (SNCR) reduction techniques) can also be used to remove NOx from the flue gases. Emissions of NOx are higher from coal-fired power plants than from gas-fired plants as a result of coal containing significant amounts of nitrogen (unlike gas) and their less efficient combustion processes.
The newer Member States of the European Union have in a number of cases also undergone significant economic structural changes since the early 1990s which has led to a general decline in certain activities which previously contributed to high levels of NOx emissions e.g. heavy industry and the closure of older inefficient power plants.
ktonnes (1000 tonnes)
A number of policies have been implemented that directly or indirectly reduce the emissions of nitrogen oxides. These include:
Emissions of NOx are covered by the EU National Emission Ceilings Directive (NECD) (2001/81/EC) and the Gothenburg protocol under the United Nations Convention on Long-Range Transboundary Air Pollution (LRTAP Convention) (UNECE 1999). The NECD generally involves slightly stricter emission reduction targets than the Gothenburg Protocol for EU-15 countries for the period 1990-2010. The Gothenburg Protocol entered into force on 17 May 2005, after ratification by 16 countries early in 2005. Table: Percentage reduction (#) required by 2010 from 1990 levels by country, for emissions of NOx 1990 - 2010: NECD 1990 - 2010: CLRTAP Gothenburg Protocol ceilings (%) Austria -46% -44% Belgium -54% -52% Bulgaria 2% 10% Cyprus 45% - Czech Republic -61% -61% Denmark -54% -54% Estonia -19% - Finland -43% -43% France -58% -56% Germany -63% -62% Greece 15% 15% Hungary -17% -17% Iceland * - - Ireland -48% -48% Italy -51% -50% Latvia -10% 24% Liechtenstein - -30% Lithuania -19% -19% Luxembourg -53% -53% Malta -16% - Netherlands -52% -50% Norway - -25% Poland -31% -31% Portugal 9% 14% Romania -5% -5% Slovakia -41% -41% Slovenia -31% -31% Spain -31% -31% Switzerland - -49% Sweden -51% -51% Turkey - -87% United Kingdom -57% -57% # The actual 2010 emission ceilings specified in the NECD and Gothenburg Protocol are expressed as absolute emissions of SO2, NOx, NH3 and NMVOC (in ktonnes). For the purposes of this indicator 1990 is considered as a 'base year' and the percentage change to emissions to meet the ceilings is calculated. Reported emissions for past years may change reflecting e.g. updated and revised emission inventory guidance, and so the % reduction required to meet the CLRTAP and NECD targets as shown here may change slightly in the future. * Emissions data not available for Iceland.
ceilings (%)
Indicator is based on officially reported national total and sectoral emissions to UNECE/EMEP (United Nations Economic Commission for Europe/Co-operative programme for monitoring and evaluation of the long-range transmission of air pollutants in Europe) Convention on Long-range Transboundary Air Pollution (LRTAP Convention), submission 2009. Recommended methodologies for emission inventory estimation are compiled in the EMEP/CORINAIR Atmospheric Emission Inventory guidebook, EEA Copenhagen (EEA, 2009). Base data are available from the EEA Data Service (http://dataservice.eea.europa.eu/dataservice/metadetails.asp?id=1096) and the EMEP web site (http://www.ceip.at/). Where necessary, gaps in reported data are filled by ETC/ACC using simple interpolation techniques (see below). The final gap-filled data used in this indicator is available from the EEA Data Service (http://dataservice.eea.europa.eu/dataservice/metadetails.asp?id=1058).
Base data, reported in SNAP, draft NFR or NFR are aggregated into the following EEA sector codes to obtain a common reporting format across all countries and pollutants:
The 'unallocated' sector corresponds to the difference between the reported national total and the sum of the reported sectors for a given pollutant / country / year combination. It can be either negative or positive. Inclusion of this additional sector means that the officially reported national totals do not require adjustment to ensure that they are consistent with the sum of the individual sectors reported by countries.
The following table shows the conversion of Nomenclature for Reporting (NFR) sector codes used for reporting by countries into EEA sector codes:
EEA classification | Non-GHGs (NFR) | GHG (CRF) |
0 National totals | National total | National totals without LUCF |
1 Energy Industries | 1A1 | 1A1 |
3 Industry (energy) | 1A2 | 1A2 |
2 Fugitive emissions | 1B | 1B |
7 Road transport | 1A3b | 1A3b |
8 Other transport (non-road mobile machinery) | 1A3 (exl 1A3b) | 1A3a, 1A3c, 1A3d, 1A3e |
9 Industry processes | 2 | 2 |
4 Agriculture | 4 + 5B | 4 |
5 Waste | 6 | 6 |
6 Other (energy) | 1A4a, 1A4b, 1A4b(i), 1A4c(i), 1A5a | 1A4, 1A5 |
10 Other (non-energy) | 3 + 7 | 3 + 7 |
12 Energy industries (power production) | 1A1a | 1A1a |
14 Unallocated | Difference between national total and sum of sectors (1 - 10) |
No methodology references available.
NOx emission estimates in Europe are thought to have an uncertainty of about ±20% (EMEP, 2009), as the NOx emitted comes both from the fuel burnt and the combustion air and so cannot be estimated accurately from fuel nitrogen alone. However, because of the need for interpolation to account for missing data, the complete dataset used will have higher uncertainty. The trend is likely to be more accurate than the individual absolute annual values - the annual values are not independent of each other.
Overall scoring: (1-3, 1=no major problems, 3=major reservations)
For references, please go to https://www.eea.europa.eu/data-and-maps/indicators/eea-32-nitrogen-oxides-nox-emissions/eea-32-nitrogen-oxides-nox or scan the QR code.
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