Key message
Good

Emissions of total ozone precursors in Slovenia decreased by 58 % in the period 1990 to 2019. Emissions of nitrogen oxides decreased by 60 %, carbon monoxide by 67 %, non-methane volatile organic compounds by 52 % and methane by 24 %. The reason is mainly the introduction of more stringent emission standards for motor vehicles. This measure contributed to a significant reduction in emissions of nitrogen oxides and carbon dioxide from road transport which is the main source of ozone precursors. Emissions of nitrogen oxides and non-methane volatile organic compounds were in 2019 below the prescribed target values, which must not be exceeded from 2010 onwards.


This indicator shows the dynamics of emissions of gases causing the formation of ground-level ozone in the period 1990–2019 and the structure of emissions of particular gases by pollution source.

An ozone precursor is a substance that contributes to the formation of ground-level (tropospheric) ozone. Ozone precursors include nitrogen oxides (NOx), carbon monoxide (CO), methane (CH4) and non-methane volatile organic compounds (NMVOC).

Total emissions of substances causing the formation of ground-level ozone are expressed as the sum of emissions of the four pollutants multiplied by corresponding factors of ground-level ozone formation. Emissions are given in NMVOC equivalents.


Charts

Figure ZR10-1: Emissions of ozone-precursors, Slovenia, 1990-2019
Sources:

National Emission database, GHG Archive, Slovenian Environment Agency, 2021 (21. 07. 2021)

Show data
NOx[index (1990 = 100)] CO[index (1990 = 100)] NMVOC[index (1990 = 100)] CH4[index (1990 = 100)] ozone precursors - total[index (1990 = 100)] NOx target value[index (1990 = 100)] NMVOC target value[index (1990 = 100)]
1990 100 100 100 100 100
1991 92.63 95.18 95.12 96.22 93.95
1992 91.74 93.86 93.18 96.88 92.64
1993 98.29 99.67 94.17 92.55 97.06
1994 101.87 97.26 95.69 92.32 98.88
1995 100.54 97.50 95.78 93.46 98.33
1996 103.00 100.86 101.24 91.82 101.94
1997 103.68 92.40 97.14 92.49 99.42
1998 92.13 80.98 90.48 94.60 89.68
1999 82.80 74.82 86.16 94.78 82.69
2000 80.11 70.62 84.96 98.47 80.30
2001 80.61 74.43 85.87 98.69 81.51
2002 80.03 63.25 79.66 99.74 77.18
2003 75.30 63.84 78.97 98.46 74.79
2004 73.41 59.57 75.68 97.12 72.01
2005 74.24 62.92 74.73 97.14 72.65
2006 74.97 55.51 71.42 94.32 70.57
2007 73.04 57.55 71.40 95.08 70.00
2008 78.02 54.79 68.36 90.52 70.82
2009 66.24 49.04 62.86 86.98 62.30
2010 65.49 49.24 61.72 85.76 61.57
2011 64.34 48.15 57.81 85.44 59.48
2012 62.23 45.98 55.51 83.45 57.30
2013 58.53 45.64 54.18 81.15 55.00
2014 52.83 39.00 50.20 77.22 49.75
2015 47.65 41.63 50.66 79.62 47.91
2016 46.86 41.38 50.95 80.98 47.59
2017 46.08 39.64 50.34 79.13 46.70
2018 43.88 36.00 49.97 76.51 44.88
2019 39.84 33.21 48.23 76.00 41.87
target 2010 62.36 61.09
Figure ZR10-2: Structure of ozone precursor emissions, by substances, Slovenia, 2019
Sources:

National Emission database, GHG Archive, Slovenian Environment Agency, 2021 (21. 07. 2021)

Show data
NOx[%] NMVOC[%] CO[%] CH4[%]
2019 45.37 13.54 39.72 1.37
Figure ZR10-3: Structure of ozone precursor emissions, by sector, Slovenia, 2019
Sources:

National Emission database, GHG Archive, Slovenian Environment Agency, 2021 (21. 07. 2021)

Show data
Energy industries[%] Manufacturing industries and construction[%] Road transport[%] Small combustion[%] Fugitive emissions from fuels[%] Industrial processes and product use[%] Other transport[%] Agriculture[%] Waste[%]
ozone precursors 5.85 8.95 25.10 21.03 1.85 15.38 9.37 11.90 0.56
NOx 12.06 11.48 44.20 9.67 0.00 0.36 13.95 8.19 0.08
NMVOC 0.49 7.51 7.24 20.07 4.21 35.68 5.65 18.50 0.66
CO 1.36 5.60 16.02 63.48 0.00 7.67 5.86 0 0.00
CH4 0.17 0.28 0.25 5.85 13.19 0 0 61.08 19.18
Figure ZR10-4: Emissions of ozone-precursors, EU-28 countries, 2019 [in kg / capita]
Sources:

National Emission database, GHG Archive, Slovenian Environment Agency, 2021 (21. 07. 2021)

Show data
emissions per capita[kg/capita]
Luxembourg 60.30
Estonia 51.48
Ireland 50.95
Latvia 49.91
Finland 49.08
Czechia 48.83
Greece 47.16
Lithuania 46.61
Poland 45.74
Denmark 42.95
Croatia 41.11
Austria 38.51
Slovakia 37.82
Slovenia 37.46
Portugal 36.80
Netherlands 34.83
Germany 34.30
Spain 33.67
France 32.56
Italy 32.02
Sweden 31.80
Cyprus 31.72
Bulgaria 31.46
Romania 31.36
EU28 31.25
Hungary 30.94
Belgium 30.63
United Kingdom 30.49
Malta 19.91

Goals

To reduce total national emissions of nitrogen oxides to 45,000 tonnes, sulphur dioxide to 27,000 tonnes, NMVOC to 40,000 tonnes and ammonia to 20,000 tonnes by 2010 as required by the Protocol to Abate Acidification, Eutrophication and Ground-level Ozone (Gothenburg Protocol) to the Convention on Long-range Transboundary Air Pollution (CLRTAP) and Directive 2001/81/EC on the reduction of national emissions of certain atmospheric pollutants (NEC Directive). National emission ceilings should also not have been exceeded since 2010. The revised Gothenburg Protocol and NEC Directive additionally prescribe the reduction of emissions of nitrogen oxides by 39%, sulphur oxides by 63%, non-methane volatile organic compounds by 23%, ammonia by 1% and PM2.5 particles by 25% by 2020 compared to emissions in 2005.


Methodology

Date of data source summarization