Transport emissions of air pollutants
Published (reviewed and quality assured)
Justification for indicator selection
This indicator analyses the transport emissions of CO, NOx, NMVOCs, PM10, PM2.5 and SOx from 1990 to 2010. The pollutants can be grouped into acidifying substances, particulates and ozone precursors. Transport contributes significantly to emissions of NOx, NMVOC, PM and CO. NOx contributes to acidification, formation of ground level ozone and particulate formation.
Acidifying substances: Acidification of soils and waters is caused by emissions of nitrogen oxides (NOx), sulphur oxides (SOx) and ammonia (NH3) into the atmosphere, and their subsequent chemical reactions and deposition on ecosystems and materials. Deposition of acidifying substances causes damages to ecosystems, buildings and materials (corrosion).
Particulate Formation: Airborne particulate matter (PM) has adverse effects on human health and can be responsible and/or contribute to a number of respiratory problems. In this assessment, ‘particulate formation’ refers to primary emissions of PM10, PM 2.5 and emissions of precursors (NOx, SOx and NH3) leading to the secondary physico-chemical production of inorganic particulate matter in the atmosphere (secondary PM). A large fraction of the urban population is exposed to levels of fine particulate matter in excess of air quality limit values set for the protection of human health.
Ozone precursors: Emissions of non-methane volatile organic compounds (NMVOC), nitrogen oxides (NOx), carbon monoxide (CO) and methane (CH4) contribute to the formation of ground-level (tropospheric) ozone which has adverse effects on human health and ecosystems.
- No rationale references available
The indicator is based on the emission trend assessment of CO, NOx, NMVOCs, SOx and primary particulates.
Emissions are expressed as percentage over the 1990 levels.
Policy context and targets
No specific emission reduction target or objective exists for transport-related emissions of acidifying substances, ozone precursors or particulates. However, emission ceiling targets for total NOx, SOx, NMVOC and NH3 emissions are specified in both the EU National Emission Ceilings Directive (NECD) and the Gothenburg protocol under the United Nations Convention on Long-Range Transboundary Air Pollution (LRTAP Convention) (UNECE 1999). Following the Directive on ambient air quality and cleaner air for Europe (2008/50/EC), a number of limit values (e.g. hourly limit values) have been set for the atmospheric concentrations of main pollutants, including SOx, NOx, air borne particulate matter (PM10, PM2.5), lead, CO, benzene and ozone. Limits have been set at levels that should prevent or reduce harmful effects on health and ecosystems. Although aiming at the reduction of greenhouse gas emissions the EU climate and energy package will also influence the emissions of air pollutants from the transport sector. In some countries national standards also apply.
Iceland, Liechtenstein, Norway, Switzerland and Turkey are not members of the European Union and hence have no emission ceilings set under the NECD. Norway and Switzerland have ratified the UNECE LRTAP Gothenburg Protocol, requiring them to reduce their emissions to the agreed ceiling specified in the protocol by 2010. Liechtenstein has also signed, but has not ratified the protocol.
Directive 2008/50/EC sets LVs for the atmospheric concentrations of main pollutants, including SOx, NOx, airborne PM (PM10, PM2.5), lead, CO, C6H6 and O3.
Both the NECD and Gothenburg protocol set reductions targets for sulphur dioxide, nitrogen oxides and non-methane volatile organic compounds and ammonia for the 32 EEA member countries. There are substantial differences in emission ceilings, and hence emission reduction percentages for different countries, due to the different sensitivities of the affected ecosystems and technical feasibility for reductions.
Related policy documents
1999 Protocol to Abate Acidification, Eutrophication and Ground-level Ozone
Convention on Long-range Transboundary Air Pollution 1999 Protocol to Abate Acidification, Eutrophication and Ground-level Ozone.
Council Directive 96/61/EC (IPPC)
Council Directive 96/61/EC of 24 September 1996 concerning Integrated Pollution Prevention and Control (IPPC). Official Journal L 257.
Directive 98/70/EC, quality of petrol and diesel fuels
Directive 98/70/EC of the European Parliament and of the Council of 13 October 1998 relating to the quality of petrol and diesel fuels and amending Directive 93/12/EEC
Directive 2001/80/EC, large combustion plants
Directive 2001/80/EC of the European Parliament and of the Council of 23 October 2001 on the limitation of emissions of certain pollutants into the air from large combustion plants
Directive 2001/81/EC, national emission ceilings
Directive 2001/81/EC, on nation al emissions ceilings (NECD) for certain atmospheric pollutants. Emission reduction targets for the new EU10 Member States have been specified in the Treaty of Accession to the European Union 2003 [The Treaty of Accession 2003 of the Czech Republic, Estonia, Cyprus, Latvia, Lithuania, Hungary, Malta, Poland, Slovenia and Slovakia. AA2003/ACT/Annex II/en 2072] in order that they can comply with the NECD.
Key policy question
Are emissions of acidifying substances, particulates and ozone precursors from transport decreasing?
Methodology for indicator calculation
For air pollutants officially reported data to EMEP/LRTAP by May 2012 has been used.
Methodology for gap fillingWhere a complete time series of emissions data has not been reported, data has been gap-filled according to EEA ETC/ACC methodologies. Details of the gap-filling procedure for the air pollutant data set are described in the European Union emission inventory report 1990–2008 under the UNECE Convention on Long-range Transboundary Air Pollution (LRTAP) (EEA Technical Report No 7/2010).
- EC emission inventory report European Community emission inventory report 1990-2008 under the UNECE Convention on Long-range Transboundary Air Pollution (LRTAP) , EEA Technical report No 7/2010.
EEA data references
- National Emission Ceilings (NEC) Directive Inventory provided by Directorate-General for Environment (DG Environment)
- National emissions reported to the Convention on Long-range Transboundary Air Pollution (LRTAP Convention) provided by United Nations Economic Commission for Europe (Environment and Human Settlements Division, UNECE)
- Air Emission data set for Indicators provided by European Environment Agency (EEA)
Data sources in latest figures
Interpolation/extrapolation procedures are used for gap-filling of the underlying emissions dataset.
Data sets uncertainty
A quantification of uncertainty in the European Union LRTAP emission inventory requires the provision of detailed underpinning information on emission uncertainties from Member States. An evaluation of uncertainty at the EuropeanUnion level (including all EU-27 Member States) has not been performed, because insufficient information has been reported by Member States.
No uncertainty has been specified
Short term work
Work specified here requires to be completed within 1 year from now.
Long term work
Work specified here will require more than 1 year (from now) to be completed.
Responsibility and ownership
EEA Contact InfoCinzia Pastorello
Typology: Descriptive indicator (Type A – What is happening to the environment and to humans?)