Emissions of air pollutants from transport

Indicator Assessment
Prod-ID: IND-112-en
Also known as: TERM 003
expired Created 23 Nov 2012 Published 04 Feb 2013 Last modified 11 Sep 2015
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Between 2009 and 2010, all air pollutant emissions from transport, except NOx, decreased (ranging between 2.5 % and 10 %). During the period 1990 to 2010, the main pollutants that contribute to acidification and particulate and ozone formation have shown a decreasing trend in emissions in the EEA‑32 (with fluctuations in some years). The largest percentage decreases over this period have been for CO (76 %) and non-methane volatile organic compound (NMVOC) (75 %). However, increases in shipping activity since 1990 have offset some of the reductions elsewhere, in particular for SOx, but also for NOx and PM. International shipping currently contributes to nearly 87 % of all transport SOx emissions. The rise of road freight transport explaines most of the increase in NOx in 2010.

Key messages

Between 2009 and 2010, all air pollutant emissions from transport, except NOx, decreased (ranging between 2.5 % and 10 %). During the period 1990 to 2010, the main pollutants that contribute to acidification and particulate and ozone formation have shown a decreasing trend in emissions in the EEA‑32 (with fluctuations in some years). The largest percentage decreases over this period have been for CO (76 %) and non-methane volatile organic compound (NMVOC) (75 %). However, increases in shipping activity since 1990 have offset some of the reductions elsewhere, in particular for SOx, but also for NOx and PM. International shipping currently contributes to nearly 87 % of all transport SOx emissions. The rise of road freight transport explaines most of the increase in NOx in 2010.

Are emissions of acidifying substances, particulates and ozone precursors from transport decreasing?

Trend in emissions of air pollutants from transport in EEA-32

Note: Transport emissions of PM2.5, CO, SOx, NMVOC, NOx in EEA member countries.

Data source:
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The contribution of the transport sector to total emissions of the main air pollutants in 2009 (EEA-32)

Note: The graphs report the percentage contribution of transport and not transport sector to total emission of air pollutants in EEA32. Transport sector includes road transport, shipping, aviation and railways.

Data source:
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Transport is one of the main sources of air pollution in Europe, particularly in cities and urban areas such as towns, airports and sea ports. Key air pollutants emitted from combustion engines in all modes of transport include NOx, PM, CO, and VOCs. However, non-exhaust emissions of PM are also released due to the mechanical wear of brakes, tyres and road surfaces, and are not currently regulated. Emissions of VOCs also come from gasoline evaporation during refuelling and from vehicle and fuel storage tanks.

The Figure shows the trend in emissions of most pollutants from transport in EEA‑32 member countries since 1990. Emissions of different pollutants have been falling but at different rates. The decline has occurred in spite of a growth in transport activities reflected by various indicators such as energy consumption and passenger and freight transport volumes since 1990. The downward trend for most pollutants has followed the progressive introduction of tighter Euro emission standards on new road vehicles supplemented by improvements in fuel quality driven by EU Fuel Quality Directives. Tighter regulations in emissions from new diesel engines for railway locomotives and the sulphur content of marine fuels have also contributed to this downward trend in emissions in more recent years. The trends in emissions of key pollutants NOx and PM2.5 have been tempered by the increased market penetration of diesel vehicles since 1990. Diesel vehicles generally emit more of these pollutants per kilometre than their gasoline equivalents, particularly black carbon which has impacts on health and the climate but also NO2.

Indicator specification and metadata

Indicator definition

This indicator is based on the emissions trend assessment of CO, NOx, NMVOCs, SOx and primary particulates. 

Units

Emissions are expressed as the percentage over 1990 levels (PM as percentage over 2000 levels).


Policy context and targets

Context description

Directive 2008/50/EC (EC, 2008) sets limit values for the atmospheric concentrations of the main pollutants, including sulphur dioxide (SO2), nitrogen dioxide (NO2), airborne particulate matter (PM10 and PM2.5), lead, carbon monoxide (CO), benzene, and ozone (O3) for EU Member States. These limits are related to transport implicitly, but the introduction of progressively stricter Euro emissions standards and fuel quality standards has led to substantial reductions in air pollutant emissions. Policies aimed at reducing fuel consumption in the transport sector, in order to cut greenhouse gas emissions, may also help to further reduce air pollutant emissions.


Iceland, Liechtenstein, Norway, Switzerland and Turkey are not members of the European Union and hence have no emissions ceilings set under the revised National Emission Ceilings Directive (NECD) 2016/2284/EU. As well as most of the EU Member States, Norway and Switzerland have ratified the 1999 United Nations Economic Commission for Europe Convention on Long-Range Transboundary Air Pollution (UNECE Trend in emissions of air pollutants from transport in EEA-33 LRTAP) Gothenburg Protocol, which required 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.

Targets

Both the NECD and the Gothenburg protocol set reductions targets for sulphur dioxide, nitrogen oxides and non-methane volatile organic compounds and ammonia for the EEA-33 member countries. There are substantial differences in emissions ceilings, and hence emissions reduction percentages for different countries, due to the different sensitivities of the ecosystems affected and the technical feasibility of making reductions.

Related policy documents

Methodology

Methodology for indicator calculation

For air pollutants, officially reported data to EMEP/LRTAP have been used; according to reporting requirement, emission for all pollutants are available from 1990, for PM2.5, PM10 and TSP from 2000. Please refer to indicators CSI002 and CSI003.

Methodology for gap filling

Where a complete time series of emissions data has not been reported, data have 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 emissions inventory report 1990–2008 under the UNECE Convention on Long-Range Transboundary Air Pollution (LRTAP) (EEA Technical Report No 7/2010).

Methodology references

  • EC emission inventory report European Community emission inventory report 1990-2015 under the UNECE Convention on Long-range Transboundary Air Pollution (LRTAP) , EEA Technical report No 9/2017.

Uncertainties

Methodology uncertainty

Interpolation/extrapolation procedures are used for gap-filling of the underlying emissions dataset.

Data sets uncertainty

The quantification of uncertainty in the European Union LRTAP emissions inventory requires that Member States provide detailed underpinning information on emissions uncertainties.

Rationale uncertainty

No uncertainty has been specified

Data sources

Generic metadata

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DPSIR: Pressure
Typology: Descriptive indicator (Type A - What is happening to the environment and to humans?)
Indicator codes
  • TERM 003
Temporal coverage:

Contacts and ownership

EEA Contact Info

Federico Antognazza

EEA Management Plan

2012 2.9.2 (note: EEA internal system)

Dates

Frequency of updates

Updates are scheduled once per year
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100