Air pollution

Briefing Published 18 Feb 2015 Last modified 17 Jul 2015, 10:42 AM
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Despite considerable improvements in past decades, air pollution is still responsible for more than 400 000 premature deaths in Europe each year. It also continues to damage vegetation and ecosystems.

Continued improvements in air pollution levels are expected under current legislation, but beyond 2030 only slow progress is expected. Additional measures are needed if Europe is to achieve the long-term objective of air pollution levels that do not lead to unacceptable harm to human health and the environment.

Context

Poor air quality adversely affects human health, the environment, and the climate. Both short-term and long-term exposure to air pollution harms health. This harm occurs either via direct exposure to air pollutants, or indirectly via pollutants transported through the air, deposited, and then accumulated in the food chain. Air pollution also harms ecosystems by contributing to eutrophication and acidification of water and soil, leading to loss of flora and fauna. Air pollution can also harm agricultural crops and forests causing yield losses. Furthermore, certain air pollutants affect the climate system by triggering positive or negative changes in global radiative forcing (see SOER 2015 briefing on the air and climate system).

Current European Union (EU) air pollution policy is underpinned by the 2005 Thematic Strategy on air pollution (TSAP).[1] This strategy established interim objectives for air quality and also established measures to ensure progress toward the goals of the 6th Environment Action Programme (6th EAP), which ran from 2002 to 2012. The 6th EAP's goal was to attain 'levels of air quality that do not give rise to significant negative impacts on, and risks to human health and the environment'. To move toward achieving the TSAP objectives, EU air legislation follows a twin-track approach of implementing both local air quality standards and source-based mitigation controls. These source-based mitigation controls include binding national limits for emissions of the most important pollutants.

The main policy instruments on air pollution within the EU include the Ambient Air Quality Directives,[2][3] and the National Emission Ceilings (NEC) Directive,[4] which contains emission ceilings for 2010 and years thereafter. In addition, there is source-specific legislation addressing industrial emissions, road and off-road vehicle emissions, fuel quality standards etc. Emissions are also addressed internationally under the 1979 Convention on Long-range Transboundary Air Pollution.

At the local level, the EU requires air quality management plans to be implemented in areas where exceedances of air quality standards occur. These plans are required to bring concentrations of air pollutants to levels below the EU legislative limit and target values.

Key trends

Vehicles, industry, power plants, agriculture, households, and waste contribute to Europe's air pollution. Emissions of the main air pollutants in Europe have declined in recent decades (Figure 1), resulting in generally improved air quality across the region. However, certain sectors have not followed this trend, and have seen emissions of some pollutants increase. For example, fine particulate matter (PM2.5) emitted directly into the air from coal and biomass combustion in households and from commercial and institutional buildings, have risen in the EU by around 9% and 11% respectively over the period 2003 to 2012.[5] These sources are now the most important contributors to total PM emissions in the EU.

Figure 1: EU-28 emission trends for the main air pollutants

Emission reductions of certain pollutants have resulted in a notable decrease of ambient concentrations of sulphur dioxide (SO2), carbon monoxide (CO), benzene (C6H6), lead (Pb) and mercury (Hg). However, due to the complex chemistry undergone by certain pollutants in the atmosphere, emission reductions have not always produced a corresponding drop in concentrations. For example, there have been substantial reductions in emissions of many of the precursors for PM and O3 in Europe, but concentrations of these have generally decreased only slowly.

Emissions from wood burning and coal burning are an important source of directly emitted PM and carcinogenic substances such as polycyclic aromatic hydrocarbons (PAHs). These emissions come from households, and commercial and institutional facilities. Emissions of benzo(a)pyrene (BaP), a PAH formed mainly from the burning of organic material, have increased by 11% between 2003 and 2012. Population exposure to BaP concentrations is significant and widespread, especially in central and eastern Europe.[5][6]

Main air pollutants affecting human health: PM, O3 and NO2

  • EU limit values for PM10 (Map 1) and NO2 were exceeded widely in Europe in 2012. The target value for O3 was also exceeded at a large number of measuring stations.
  • 21% of the EU urban population lives in areas where the EU air quality 24-hour limit value for PM10 was exceeded in 2012. For EEA-33 countries the estimate is 38% of the urban population. Exposure to PM10 levels exceeding the stricter World Health Organization (WHO) air quality guidelines (AQGs) is significantly higher, comprising 64% of the total EU urban population in 2012.
  • 14% of the urban population of both the EU and EEA-32 live in areas where the EU O3 target value for protecting human health was exceeded in 2012. The percentage exposed to O3 levels exceeding the WHO AQG standard is significantly higher, comprising 98% of the EU's total urban population.

Map 1: Concentrations of PM10 in 2012 at traffic, urban, industrial and rural sites

Source: AirBase — The European air quality database v. 8.
Note
: The red and dark red dots indicate stations reporting exceedances of the 2005 daily limit value (50 μg/m3), as set out in the Air Quality Directive (EU, 2008).

Air pollution impacts on ecosystems

  • Significant improvements in reducing ecosystem exposure to excess levels of acidification have been made over past decades, largely due to declines in emissions of sulphur dioxide, one of the main acidifying compounds. However, this improvement has not been matched with a parallel improvement in eutrophication levels. This is because emissions of pollutants containing nitrogen  which can lead to eutrophication  have not fallen as much as emissions of sulphur.[7]
  • Ammonia (NH3) emitted from agricultural activities, and nitrogen oxides (NOX) from combustion processes are the predominant eutrophying air pollutants. Exceedances of eutrophication critical loads occur across most of continental Europe. It is estimated that around 63% of European ecosystem areas  and 73% of the area covered by Natura 2000-protected sites  were exposed to air-pollution levels exceeding eutrophication limits in 2010.[7]
  • The EU target value for protection of vegetation from O3 has been exceeded in a substantial part of the agricultural area in Europe, notably in southern and central Europe. The long-term objective for vegetation protection from O3 was exceeded in 88% of the total agricultural area in 2011.[7]

Prospects

Air pollution is projected to further decline in future years, but beyond 2030 only slow progress is expected. In late 2013, the European Commission proposed a Clean Air Policy Package for Europe, which aims at achieving full compliance with existing air quality legislation by 2020, and at further improving Europe's air quality by 2030 and beyond.[8] The package proposes strengthening the implementation of existing legislation; introducing stricter national emission-reduction commitments; and reducing emissions from medium-size combustion plants.

As part of this package, the Commission has put forward a revised NEC Directive, which proposes new national emission-reduction commitments for 2020 and 2030. This revised NEC Directive would apply to the pollutants currently covered (NOx, NMVOC, SO2, and NH3) and would add two new pollutants, PM2.5 and methane (CH4). It would also promote mitigation measures for black carbon.

The proposals  if agreed and fully implemented  are projected to reduce health impacts (premature mortality due to PM and O3 pollution) by 53% in the EU by 2030 relative to 2005. 40% of this is estimated to be delivered by a full implementation of existing legislation.

Figure 2: Estimated future air pollution health impacts of fine particulate matter and ozone under a current legislation scenario

However, even with the implementation of these proposals, about 50% of the EU's ecosystem area is projected to exceed eutrophication critical loads in 2030.

Beyond 2030, a time horizon of 2050 has been suggested as an aspirational year to achieve Europe's long-term objectives of achieving levels of air pollution that do not lead to unacceptable harm to human health and the environment.[9] To achieve such longer-term air quality objectives, it will become increasingly important that air pollution and climate-change policy are considered in an integrated manner. Measures to abate air pollution and GHGs often target the same sources. Factoring air quality into decisions about how to reach climate change targets, and vice-versa, can deliver greater benefits to society.

References

[1] European Commission (2005), Communication from the Commission to the Council and the European Parliament. Thematic Strategy on air pollution. COM (2005) 446 final.

[2] EU (2004), Directive 2004/107/EC of the European Parliament and of the Council of 15 December 2004 relating to arsenic, cadmium, mercury, nickel and polycyclic aromatic hydrocarbons in ambient air (OJ L 23, 26.1.2005, pp. 316).

[3] European Commission (2008), Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe (OJ L 152, 11.6.2008, pp. 1–44).

[4] EU (2001), Directive 2001/81/EC of the European Parliament and of the Council of 23 October 2001 on national emission ceilings for certain atmospheric pollutants (OJ L 309, 27.11.2001, pp. 22–30).

[5] EEA (2014), European Union emission inventory report 1990–2012 under the Convention on Long‑range Transboundary Air Pollution (LRTAP), EEA Technical report No 12/2014, European Environment Agency.

[6] EEA (2014), Air quality in Europe — 2014 report, EEA Report No 5/2014, European Environment Agency.

[7] EEA (2014), Indicator on Exposure of ecosystems to acidification, eutrophication and ozone (CSI005), accessed 1 June 2014.

[8] European Commission (2013), Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions 'A Clean Air Programme for Europe' (COM(2013) 0918 final).

[9] Maas R.; Engleryd A. and Dame E. (2009), 'Towards a joint strategy for air pollution and climate change', in: Pleijel, H. (ed.) Air pollution and climate change — two sides of the same coin?, Swedish Environmental Protection Agency.

Additional information

IIASA (2013), Policy scenarios for the revision of the Thematic Strategy, TSAP Report#10, accessed 27 August 2014.

Related content

Based on indicators

Exposure of ecosystems to acidification, eutrophication and ozone Exposure of ecosystems to acidification, eutrophication and ozone Acidification and eutrophication Acidification: In the EU-28, the ecosystem area where acidification critical loads were exceeded decreased from 43% in 1980 to 7% in 2010 (7% for all EEA member countries). There remain some areas where the interim objective for reducing acidification, as defined in the National Emission Ceiling Directive 2001/81/EC, has not been met.  Eutrophication: The EU-28 ecosystem area, where the critical loads for eutrophication were exceeded, peaked at 84% in 1990 and decreased to 63% in 2010 (55% in EEA member countries). This percentage is projected to decrease to 54% in 2020, assuming implementation of current legislation (48% in EEA member countries). The magnitude of the exceedances is projected to reduce considerably in most areas, except for a few 'hot spot' areas in western France and the border areas between the Netherlands, Belgium and Germany, as well as in northern Italy. Outlook: Only 4% of the EU-28 ecosystem area is still projected to be in exceedance of acidification critical loads in 2020 if current legislation is fully implemented (3% in EEA member countries). The eutrophication reduction target set in the updated EU air pollution strategy proposed by the European Commission in late 2013, will be met by 2030 if it is assumed that all maximum technically feasible reduction measures are implemented, but will not be met by current legislation. Ozone Most of the vegetation and agricultural crops are exposed to ozone levels exceeding the long term objective given in the EU Air Quality Directive 2008/50/EC. A significant fraction is also exposed to levels above the target value threshold defined in the directive. For the past three years, however, the agricultural area exposed to concentrations above the target value threshold is well below 25%. Accumulated concentrations of crop exposure to ozone over summer months  show large year-to-year variations. There is a tendency to decreasing levels after 2006, although this is not statistically significant. With regard to forest ozone exposure, during the period 2004 to 2011, 60% or more of the forest area has been exposed to concentrations above the critical level set by the Convention on Long-range Transboundary Air Pollution.

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