Data for Slovenia:

Objectives summarised by: Protocol to the 1979 Convention on Long-Range Transboundary Air Pollution to Abate Acidification, Eutrophication and Ground-Level Ozone and Directive 2001/81/EC on national emission ceilings for certain atmospheric pollutants. Control and reduction of emissions into the air is also the objective of the National Environmental Action Plan 2005-2012.
Source database or source: For the calculation of the indicator, the following official data was used:
- emissions of air pollutants, which can be found at the Central Data Repository (CDR), summarised from the National Emissions Inventory,
- greenhouse gases, deposited at the Central Data Repository (CDR), summarised from the GHG Archive.
Date of acquisition for this indicator: 23 December 2009 – data on emissions of air pollutants; 15 January 2010 – data on greenhouse gases.
Data administrator: Environmental Agency of the Republic of Slovenia (ARSO), Environment Office, Air Quality Division – contact persons: Bojan Rode, Tajda Mekinda-Majaron.
Methodology and frequency of data collection for the indicator: The data was prepared on an annual basis from the data on activities (fuel consumption, number of animals, amount of waste, industrial manufacturing, etc), calorific values of fuels and emission factors. The recommended methodology for air pollutants was prepared by a group for emissions inventory and projections of UNECE/EMEP, and for GHG by the Intergovernmental Panel on Climate Change (IPCC). For the preparation of new records, data for the past is also frequently corrected.
Data processing methodology: Total emissions are calculated as the weighted sum of emissions of individual substances. The same weighting factors were used as implemented by the European Environment Agency for its calculations.
Weighting for ground-level ozone was calculated on the basis of the potential of individual substances to form ground-level ozone (»TOFP – Tropospheric Ozone Forming Potential«). Weightings were determined in the study (de Leeuw, 2002) and amount to: NO_x – 1.22; NMVOC – 1.0; CO – 0.11; CH₄ – 0.014. The unit is a kt equivalent of NMVOC.
The total emissions of acidifying substances were calculated by weightings, calculated on the basis of the assessment of the acidification potential of an individual substance (»Acid equivalent«). Weightings were determined in the research study (de Leeuw, 2002) and amount to: SO₂ – 2/64; NO_x – 1/46; NH₃ – 1/17. The unit is a kt equivalent of acidifying substances.
The total emissions of particulates were calculated by using weightings, determined on the basis of assessments on the deposition and reactions of particulate precursors (de Leeuw, 2002) – Aerosol formation factors and amount to: SO₂ – 0.54; NO_x – 0.88; NH₃ – 0.64; PM₁₀ – 1.00. The unit is a kt equivalent of PM₁₀ emissions.
The average annual growths of emissions were calculated as [(last year/base year)(1 /number of years) –1] x 100.
Information concerning data quality:
- Advantages and disadvantages (at data level): The officially reported data, calculated on the basis of internationally verified methodologies, were used for the calculation of the indicator.
- Relevance, accuracy, robustness, uncertainty (at data level):
Reliability of the indicator (archive data): The reliability of data for the GHG emissions (CH₄) was estimated for 1986, 2002 and 2003. For absolute data, it amounts to 16 %, 13.1 % and 12 %, and for trends for the years 2002 and 2003 to 4 % or 3 % respectively. The reliability of emission factors and data on activities was estimated on the basis of an expert assessment. The reliability of data of emissions of external air pollutants differs strongly between substances. The highest data reliability exists for SO₂ emissions, since these emissions are directly connected to the concentration of sulphur in fuel, and dependant on the efficiency of purification plants when cleaning flue gases. Data on NO_x emissions is much less reliable, since there are more sources for the formation of emissions. Emissions are dependent on the concentration of nitrogen in fuel, the ratio of air and fuel as well as on the combustion temperature, which is a characteristic of combustion plants – that is why emissions factors are different for each plant. The reliability of data for NH₃ emissions is high, since they were almost the same when using two different methodologies.
Uncertainty of the indicator (scenarios/projections): Projections have not been prepared.
- Overall assessment (1 = no major comments, 3 = data to be considered with reservation):
Relevance: 1
Accuracy: 2
Completeness over time: 2
Completeness over space: 1

Other sources and literature:
- Second report on the Implementation of the Operational Programme for Limiting Greenhouse Gas Emissions until 2012 for 2008. 2009. Ljubljana, Ministry of the Environment and Spatial Planning.
- Operational Programme for Limiting Greenhouse Gas Emissions until 2012 (OP TGP-01). 2009. Ljubljana, Ministry of the Environment and Spatial Planning.
- Resolution on National Environmental Action Plan 2005–2012. OG RS, no. 2/2006.
- Slovenia’s National Inventory Report 2009. 2009. Ljubljana, Environmental Agency of the Republic of Slovenia.
- Communication from the Commission to the European Council and the European Parliament - An Energy Policy for Europe {SEC(2007) 12}. 2007. Brussels, Commission of the European Communities.
- TERM 2006 03 EEA32 – Transport emissions of air pollutants (CO, NH₃, NO_x, NMVOCs, PM₁₀, SO_x) by mode. Indicator fact sheet. European Environment Agency.
- Act Ratifying the Kyoto Protocol to the United Nations Framework Convention on Climate Change (MKPOKSP). OG RS, no. 60/2002.