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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.
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Total emissions of primary sub-10µm particulate matter (PM 10 ) have reduced by 26% across the EEA-32 region between 1990 and 2010, driven by a 28% reduction in emissions of the fine particulate matter (PM 2.5 ) fraction. Emissions of particulates between 2.5 and 10 µm have reduced by 21% over the same period; the difference of this trend to that of PM 2.5 is due to significantly increased emissions in the 2.5 to 10 µm fraction from 'Road transport' and 'Agriculture' (of 50% and 15% respectively) since 1990. Of this reduction in PM 10 emissions, 39% has taken place in the 'Energy Production and Distribution' sector due to factors including the fuel-switching from coal to natural gas for electricity generation and improvements in the performance of pollution abatement equipment installed at industrial facilities.
Emissions of the main ground-level ozone precursor pollutants have decreased across the EEA-32 region between 1990 and 2010; nitrogen oxides (NO X ) by 42%, non-methane volatile organic compounds (NMVOC) by 53%, carbon monoxide (CO) by 61%, and methane (CH 4 ) by 32%. This decrease has been achieved mainly as a result of the introduction of catalytic converters for vehicles, which has significantly reduced emissions of NO X and CO from the road transport sector, the main source of ozone precursor emissions. The EU-27 as a whole has not met its 2010 target to reduce emissions of NO X , one of the two ozone precursors (NO X and NMVOC) for which emission limits exist under the EU's NEC Directive (NECD). Whilst total NMVOC emissions in the EU-27 were below the NECD limit in 2010, a number 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 2010 that were lower than their respective ceilings, however Liechtenstein and Norway reported NO X emissions higher than their ceiling for 2010.
EEA-32 emissions of a number of compounds categorised as persistent organic pollutants (POPs) have decreased between 1990 and 2010, including hexachlorobenzene (HCB) by 91%, hexachlorocyclohexane (HCH) by 93%, polychlorinated biphenyls (PCBs) by 74%, dioxins & furans by 83%, and poly-aromatic hydrocarbons (PAHs) by 52%. While the majority of individual countries report that POP emissions have fallen during this period, a number report that increases in emissions of one or more pollutants have occurred. In 2010, the most significant sources of emissions for these POPs included the sectors 'Commercial, institutional and households' (11% of HCB, 37% of dioxins and furans, 18% of PCB emissions) and 'Industrial processes' (70% of HCB, 66% of HCH, 28% of PCBs). Important emission sources of PAH include residential combustion processes (open fires, coal and wood burning for heating purposes etc.), industrial metal production processes, and the road transport sector. Emissions from these sources have all declined since 1990 as a result of decreased residential use of coal, improvements in abatement technologies for metal refining and smelting, and stricter regulations on emissions from the road transport sector. Environmental context: Persistent organic pollutants (POPs) are chemical substances that persist in the environment, have potential for biomagnification through the food web, and pose a risk of causing adverse effects to human health and the environment. This group of substances includes unintentional by-products of industrial processes (such as PAHs, dioxins and furans) pesticides (such as DDT) and industrial chemicals such as polychlorinated biphenyls (PCBs). All share the property of being progressively accumulated higher up the food chain, such that bioaccumulation in lower organisms to relatively low concentrations can expose higher consumer organisms, including humans, to potentially harmful concentrations. In humans they are also of concern for human health because of their toxicity, their potential to cause cancer and their ability to cause harmful effects at low concentrations. Their relative toxic/carcinogenic potencies are compound specific, but in general the major concerns are centred on their possible role in causing cancer, neurobehavioral, immunological and reproductive disorders. More recently concern has also been expressed over their possible harmful effects on human development.
EEA-32 emissions of non-methane volatile organic compounds (NMVOCs) have decreased by 53% since 1990. In 2010, the most significant sources of NMVOC emissions were 'Solvent and product use' (42%), comprising activities such as paint application, dry-cleaning and other use of solvents, followed by 'Commercial, institutional and households' (18%). The decline in emissions since 1990 has primarily been due to reductions achieved in the road transport sector due to the introduction of vehicle catalytic converters and carbon canisters on petrol cars for evaporative emission control, driven by tighter vehicle emission standards, combined with limits on the maximum volatility of petrol that can be sold in EU Member States, as specified in fuel quality directives. The reductions in NMVOC emissions have been enhanced by the switching from petrol to diesel cars in some EU countries, and changes in the 'Solvents and product use' sector as a result of the introduction of legislative measures limiting the use and emissions of solvents. The majority of EU-27 Member States have reduced emissions since 1990 in line with their obligations under the National Emission Ceilings Directive (NECD), however two Member States have not met their ceilings (Germany and Spain) [1] . Emissions in 2010 for the three non-EU countries which have emission ceilings for 2010 set under the UNECE/CLRTAP Gothenburg protocol (Liechtenstein, Norway and Switzerland) were all well below their respective ceilings. Environmental context: Non-methane volatile organic compounds (NMVOCs) are a collection of organic compounds that differ widely in their chemical composition but display similar behaviour in the atmosphere. NMVOCs are emitted into the atmosphere from a large number of sources including combustion activities, solvent use and production processes. Biogenic NMVOC are emitted by vegetation, with amounts dependent on the species and on temperature. NMVOCs contribute to the formation of ground-level (tropospheric) ozone, and certain species such as benzene and 1,3 butadiene are directly hazardous to human health. Quantifying the emissions of total NMVOC provides an indicator of the emissions of the most hazardous NMVOCs. [1] Emissions data reported by EU member states under NECD is used for comparison with NECD ceilings, and data reported under CLRTAP is used for all other calculations unless otherwise stated.
Across the EEA-32 countries, emissions of lead have decreased by 89%, mercury by 63% and cadmium by 60% between 1990 and 2010. For each substance, the most significant sources in 2010 are from energy-related fuel combustion, particularly from public power and heat generating facilities, and from industrial facilities. Much progress has been made since the early 1990s in reducing point source emissions of cadmium and lead (e.g. emissions from industrial facilities). This has been achieved through improvements in, for example, abatement technologies for wastewater treatment, incinerators and in metal refining and smelting industries, and in some countries by the closure of older industrial facilities as a consequence of economic re-structuring. In the case of mercury, the observed decrease in emissions may be largely attributed to improved controls on mercury cells used in industrial processes (e.g. in the chlor-alkali process) including the replacement of old mercury cells by diaphragm or membrane cells, and the general decline of coal use across Europe as a result of fuel switching. The promotion of unleaded petrol within the EU and in other EEA member countries through a combination of fiscal and regulatory measures has been a particular success story. EU Member States have completely phased out the use of leaded petrol, a goal that was regulated by Directive 98/70/EC. From being the largest source of lead emissions in 1990, when it contributed around 75% of the EEA-32 total for lead, emissions from the road transport sector have decreased by nearly 99%. Nevertheless, the road transport sector still remains an important source of lead, contributing around 10% of total lead emissions in the EEA-32 region. However since 2002 little progress has been made in reducing emissions further; 98% of the total reduction from 1990 emissions of lead had been achieved by 2002. Environmental context: Heavy metals (such as cadmium, lead and mercury) are recognised as being toxic to biota. All are prone to biomagnification, i.e. being progressively accumulated higher up the food chain, such that bioaccumulation in lower organisms at relatively low concentrations can expose higher consumer organisms, including humans, to potentially harmful concentrations. In humans they are also of direct concern because of their toxicity, their potential to cause cancer and their potential ability to cause harmful effects at low concentrations. The relative toxic/carcinogenic potencies of heavy metals are compound specific, but exposure to heavy metals has been linked with developmental retardation, various cancers and kidney damage. Metals are persistent throughout the environment, and cadmium, lead and mercury are among those heavy metals that are already a focus of international and EU action. These substances tend not just to be confined to a given geographical region, and thus are not always open to effective local control. For example, in the case of cadmium, much is found in fine particles which do not readily dry-deposit, and therefore have long residence times in the atmosphere and are subject to long-range transport processes.
EEA-32 emissions of NH 3 have declined by 28% between the years 1990 and 2010. Agriculture was responsible for 94% of NH 3 emissions in 2010. The reduction in emissions within the agricultural sector is primarily due to a reduction in livestock numbers (especially cattle) since 1990, changes in the handling and management of organic manures and from the decreased use of nitrogenous fertilisers. The reductions achieved in the agricultural sector have been marginally offset by the increase in annual emissions over this period in the road-transport sector, and to a lesser extent the 'Solvent and product use' and 'Non-road transport' sectors. All but two of the EU-27 Member States reported 2010 national NH 3 emissions under NECD below the level of the 2010 emission ceilings set in the National Emission Ceilings Directive (NECD) [1] . Emissions in 2010 for two of the three non-EU countries having emission ceilings set under the UNECE/CLRTAP Gothenburg protocol (Liechtenstein, Norway and Switzerland) were also below the level of the respective 2010 ceilings. Environmental context: NH 3 contributes to acid deposition and eutrophication. The subsequent impacts of acid deposition can be significant, including adverse effects on aquatic ecosystems in rivers and lakes and damage to forests, crops and other vegetation. Eutrophication can lead to severe reductions in water quality with subsequent impacts including decreased biodiversity, changes in species composition and dominance, and toxicity effects. NH 3 also contributes to the formation of secondary particulate aerosols, an important air pollutant due to its adverse impacts on human health. [1] Emissions data reported by EU member states under NECD is used for comparison with NECD ceilings, and data reported under CLRTAP is used for all other calculations unless otherwise stated. 2010 emissions reported under NECD in 2012 by 11 member states differed from that reported under CLRTAP.
EEA-32 emissions of nitrogen oxides (NO X ) decreased by 42% between 1990 and 2010. In 2010, the most significant sources of NO X emissions were the 'Road transport' (41%), 'Energy production and distribution' (22%) and the 'Commercial, institutional and households' and 'Energy use in industry' (both 13%) sectors. The largest reduction of emissions in absolute terms since 1990 has occurred in the road transport sector. These reductions have been achieved despite the general increase in activity within this sector since the early 1990s and have primarily been achieved as a result of fitting three-way catalysts to petrol fuelled vehicles. However, ambient urban concentrations of NO2 in EU-27 countries in recent years have not fallen by as much as reported emissions. From 2001 to 2010, NO2 annual mean concentrations at urban background sites fell by just 10.6% on average (CSI004 - Fig 5) during which time the reported NO X emissions for the EU-27 decreased by 24.9%. The disparity between trends in NO X emissions and ambient NO2 concentration is due in part to increased penetration of diesel vehicles, and the ‘real-world’ emission performance of modern diesel vehicles not showing the improvements that were indicated by the test cycle emission factors used for emission inventories. It is also due to the increased proportion of NO X emitted directly as NO2 from the exhaust of more modern diesel vehicles which use catalyst systems for controlling emissions of other pollutants. As a result of this difference, a number of member states' NO X emissions could be significantly higher than currently calculated. In the electricity/energy production sector reductions have also occurred as a result of measures such as the introduction of combustion modification technologies (such as use of low NO X burners), implementation of flue-gas abatement techniques (e.g. NO X scrubbers and selective catalytic and non-catalytic reduction techniques, i.e. SCR and SNCR) and fuel-switching from coal to gas. The National Emission Ceilings Directive (NECD) specifies NO X emission ceilings for Member States that must have been met by 2010. In general, the newer EU Member States have made substantially better progress towards meeting their respective NO X ceilings than the older Member States of the EU-15. Eleven of the twelve post-2004 Member States had reduced their 2010 emissions beyond what is required under the NECD [1] , with the remaining one reporting NO X emissions just 2% above the NECD target. In contrast, only four of the EU-15 Member States reported emissions for 2010 within their respective national ceilings. Of the three non-EU countries having emission ceilings set under the UNECE/CLRTAP Gothenburg protocol (Liechtenstein, Norway and Switzerland), only Switzerland reported 2010 emissions below the level of their 2010 ceiling. Environmental context: NO X contributes to acid deposition and eutrophication of soil and water. The subsequent impacts of acid deposition can be significant, including adverse effects on aquatic ecosystems in rivers and lakes and damage to forests, crops and other vegetation. Eutrophication can lead to severe reductions in water quality with subsequent impacts including decreased biodiversity, changes in species composition and dominance, and toxicity effects. NO2 is associated with adverse effects on human health, as at high concentrations it can cause inflammation of the airways and reduced lung function, increasing susceptibility to respiratory infection. It also contributes to the formation of secondary particulate aerosols and tropospheric ozone in the atmosphere, both of which are important air pollutants due to their adverse impacts on human health and other climate effects. [1] Emissions data reported by EU member states under NECD is used for comparison with NECD ceilings, and data reported under CLRTAP is used for all other calculations unless otherwise stated.
EEA-32 emissions of sulphur oxides (SO X ) have decreased by 75% between 1990 and 2010. In 2010, the most significant sectoral source of SO X emissions was 'Energy production and distribution' (57% of total emissions), followed by emissions occurring from 'Energy use in industry' (21%) and in the 'Commercial, institutional and households' (14%) sector. The reduction in emissions since 1990 has been achieved as a result of a combination of measures, including fuel-switching in energy-related sectors away from high-sulphur solid and liquid fuels to low-sulphur fuels such as natural gas, the fitting of flue gas desulphurisation abatement technology in industrial facilities and the impact of European Union directives relating to the sulphur content of certain liquid fuels. All of the EU-27 Member States have reduced their national SO X emissions below the level of the 2010 emission ceilings set in the National Emission Ceilings Directive (NECD) [1] . Emissions in 2010 for the three non-EU countries having emission ceilings set under the UNECE/CLRTAP Gothenburg protocol (Liechtenstein, Norway and Switzerland) were also below the level of their respective 2010 ceilings. Environmental context: Sulphur dioxide is emitted when fuels containing sulphur are combusted. It is a pollutant which contributes to acid deposition which in turn can lead to changes occurring in soil and water quality. The subsequent impacts of acid deposition can be significant, including adverse effects on aquatic ecosystems in rivers and lakes and damage to forests, crops and other vegetation. SO 2 emissions also aggravate asthma conditions and can reduce lung function and inflame the respiratory tract, and contribute as a secondary particulate pollutant to formation of particulate matter in the atmosphere, an important air pollutant in terms of its adverse impact on human health. Further, the formation of sulphate particles in the atmosphere after its release results in reflection of solar radiation, which leads to net cooling of the atmosphere. [1] Emissions data reported by EU member states under NECD is used for comparison with NECD ceilings, and data reported under CLRTAP is used for all other calculations unless otherwise stated.
Emissions of the acidifying pollutants, nitrogen oxides (NO X ), sulphur oxides (SO X ) and ammonia (NH 3 ), have decreased significantly in most of the individual EEA member countries between 1990 and 2010. Emissions of SO X have decreased by 75%, NO X by 42% and NH 3 emissions by 28% since 1990 within the EEA-32. Data reported under the NECD indicates that the EU-27 as a whole has met its overall target to reduce emissions of SO X and NH 3 as specified by the EU’s National Emissions Ceiling Directive (NECD). However twelve individual Member States, and the EU as a whole, reported emissions in the 2010 above their NECD 2010 emission ceilings for NO X , although the twelve Member States joining the EU in 2004/7 reported combined emissions below their collective NECD ceiling. Three EU-27 member states also reported 2010 NH 3 emissions above the levels of their NECD ceilings, neither of which are in the group of twelve new EU member states. Of the three non-EU countries having emission ceilings for 2010 under the UNECE/CLRTAP Gothenburg protocol (Liechtenstein, Norway and Switzerland), both Liechtenstein and Norway reported NO X emissions in 2010 that were substantially higher than their respective 2010 ceilings. Liechtenstein also reported 2010 NH 3 emissions above the level of their Gothenburg protocol 2010 ceiling.
Eutrophication The magnitude of the risk of ecosystem eutrophication and its geographical coverage has diminished only slightly over the years. The predictions for 2010 and 2020 indicate that the risk is still widespread over Europe. This is in conflict with the EU's long-term objective of not exceeding critical loads of airborne acidifying and eutrophying substances in sensitive ecosystem areas (National Emission Ceilings Directive, 6th Environmental Action Programme, Thematic Strategy on Air Pollution). Acidification The situation has considerably improved and it is predicted to improve further. The interim environmental objective for 2010 (National Emission Ceilings Directive) will most likely not be met completely. However, the European ecosystem areas where the critical load will be exceeded is predicted to have declined by more than 80 % in 2010 with 1990 as a base year. By 2020, it is expected that the risk of ecosystem acidification will only be an issue at some hot spots, in particular at the border area between the Netherlands and Germany. Ozone (O 3 ) Most vegetation and agricultural crops are exposed to ozone levels exceeding the long term objective given in the EU Air Quality Directive. A significant fraction is also exposed to levels above the 2010 target value defined in the Directive. Concentrations in 2009 were on the average lower than in 2008. The effect-related accumulated concentrations, addressing exposure of crops to ozone over several summer months, shows large year-to-year variations. Over the period 1996-2009 there is a tendency to increased exposure, although this development has not proven to be statistically significant.
Particulate Matter (PM 10 ) In the period 2001-2010, 18-41 % of the urban population in EU-27 was potentially exposed to ambient concentrations of particulate matter (PM 10 ) in excess of the EU limit value set for the protection of human health (50 microgram/m 3 daily mean not to be exceeded more than 35 days a calendar year); (Figure 1). Nitrogen dioxide (NO 2 ) In the period 2001-2010, 6-27 % of the urban population in EU-27 was potentially exposed to ambient nitrogen dioxide (NO 2 ) concentrations above the EU limit value set for the protection of human health (40 microgram NO 2 /m 3 annual mean). There was a slight downwards trend over the period (Figure 1) Ozone (O 3 ) In the period 2001-2010, 15-61 % of the urban population in EU-27 was exposed to ambient ozone concentrations exceeding the EU target value set for the protection of human health (120 microgram O 3 /m 3 daily maximum 8-hourly average, not to be exceeded more than 25 times a calendar year, averaged over three years and to be achieved where possible by 2010). The 61 % of the urban population exposed to ambient ozone concentrations over the EU target value was recorded in 2003, which was the record year. There was no discernible trend over the period (Figure 1). Sulphur dioxide (SO 2 ) In the period 2001-2010, the fraction of the urban population in EU-27 that is potentially exposed to ambient concentrations of sulphur dioxide in excess of the EU limit value set for the protection of human health (125 microgram SO 2 /m 3 daily mean not to be exceeded more than three days a year), decreased to less than 1 %, and as such the EU limit value set is close to being met everywhere in the urban background (Figure 1).
Energy-related emissions account for only 2% of NH 3 emissions but 96% of NO x and 94% of SO 2 emissions in the EEA-32 in 2009. They fell by 17%, 13% and 21% respectively between 2005 and 2009 in EEA-32 countries. Since 1990, these energy related emissions declined by 40% and 78% for NO x and SO 2 respectively but increased by 88% for NH 3 in the EU-27 and declined by 37% (NO x ) and 74% (SO 2 ) and increased by 92% (NH 3 ) in EEA-32 member countries. However as noted earlier the percentage of energy related NH 3 emissions are insignificant compare do the non-energy related NH 3 emissions. Most of the total reduction in pollutants contributing to acid deposition since 1990 is accounted for by lower SO 2 emissions from the energy-producing sector and lower NO x emissions from the transport sector. The EU-27 is broadly on track to meet its overall targets set under the NEC Directive (NECD) [1] , however further reductions are needed to improve remaining local and transboundary air pollution issues, and for ensuring that individual countries meet emissions ceiling targets under the NECD and the UNECE Gothenburg Protocol. [1] See Pollutant Specific Factsheet NOx
Energy-related emissions accounted for 87% of all Carbon Monoxide (CO) emissions, 43% of all Non-Methane Volatile Organic Compounds (NMVOC) emissions, 96% of all Nitrogen Oxide (NO x ) emissions and 4.7% of all Methane (CH 4 ) emissions from the EEA-32 in 2009. Since 1990(2005), these emissions have declined by 58(13)%, 63(13)%, 37(13)% and 22(+8)% in EEA member countries. The largest reduction in emissions occurred in the road transport sector, largely as a result of the continued introduction of catalytic converters in new vehicles during this period and more stringent regulations on emissions.
Energy-related emissions of primary particulate matter, PM 10 and PM 2.5 , account for 68% and 81% of total PM 10 and PM 2.5 emissions respectively in the EEA-32 in 2009. These energy related emissions fell by 7% and 10% respectively between 2005 and 2009 and 31% and 35% between 1990 and 2009. The most important reductions were achieved in the energy supply sectors (Energy Industries and Fugitive emissions) as a result of fuel switching from coal and oil to natural gas.
Between 1990 and 2008, EEA32 emissions of sulphur dioxide (SO 2 ) and nitrogen oxides (NOx) from public electricity and heat production fell despite a 35% increase in the amount of electricity and heat produced. Carbon dioxide (CO 2 ) emissions decreased by 4.3% from the 1990 baseline, primarily as a result of the economic downturn. SO 2 emissions fell by 70%, due mainly to abatement techniques, use of low-sulphur fuels, and fossil fuel switching. NOx emissions fell by 41%, primarily due to abatement techniques. Some emissions have risen in recent years due to increased utilisation of existing coal plant with higher emissions per unit of output.
The emissions and emissions intensity of carbon dioxide (CO 2 ), sulphur dioxide (SO 2 ) and nitrogen oxides (NO x ) from public conventional thermal power plants has decreased substantially since 1990, particularly in the case of SO 2 and NO x . This is primarily due to a decline in the use of coal, and replacement of old, inefficient coal plant as well as the use of abatement techniques. However, since 2000 a rise in the coal-fired electricity production has slowed the decline in emissions intensity. Rising overall electricity consumption has also acted to partly offset the environmental benefits from improvements in emissions intensity.
The data analysed from selected stations in major urban agglomerations indicate that during the period 1999-2008 mean values of NO 2 concentrations at road traffic stations remain relatively stable (trend is smaller than the statistical uncertainty on estimate). An increase is observed after 2003 in the maximum observed concentrations and although a slight reduction is observed in 2007, a further increase is noted in 2008. The background concentrations remain relatively stable throughout the period 1999-2008. For PM10, a slight increase was observed in 2003 in the maximum background concentrations, but these have followed a downward trend since. The trend in the maximum PM10 concentration at traffic stations varies during the period 2002-2008, with a downward trend observed between 2002-2004, an increase in 2006 and a downward trend thereafter. Throughout the period 2002-2007 mean traffic and mean background concentrations remain relatively stable, with a slight downward trend observed in recent years.
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