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In last decade major emissions of air pollutants from transport decreased. However transport, especially road transport, remains one of the most significant air pollutant. In 2013 road transport contributed 53% to the total emissions of nitrogen oxides. Emissions of substances that cause acidification in the period 1990-2013 reduced by 41%, emissions of ozone precursors by 60%. Emissions of particulate matter in the period 2000-2013 decreased by 12%.


The indicator shows the transport emissions of acidifying substances, ozone precursors and particulates. The structure of emissions is indicated by individual substances.

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

Acidifying substances include: sulphur dioxide (SO2), nitrogen oxides (NOx) and ammonia (NH3).

Particulate emissions can be subdivided into primary particulates PM10 (particulates with a diameter of 10 μm or less, which are directly emitted to air) and secondary particulates PM10 or particulate precursors (part of emissions of NOx, SO2 and NH3, which are as a result of photochemical reactions transformed into particulates with a diameter of 10 μm or less).


Charts

Figure PR08-1: Air emissions from transport, Slovenia, 1990-2013
Sources: 

National database on air emissions, Greenhouse gas database, Slovenian Environment Agency, 2015.

Show data
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
acidifying substances 1000 t acid equivalents 1 1 1 1 1 1 1 1 1 1
ozone precursors 1000 t NMVOC equivalents 103 96 92 97 101 101 107 99 83 72
particulate matter 1000 t PM10 equivalents
acidifying substances index (1990 = 100) 100 94 90 96 104 89 95 94 80 72
ozone precursors index (1990 = 100) 100 93 89 94 98 98 103 96 80 70
particulate matter index (2000 = 100)
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
acidifying substances 1000 t acid equivalents 1 1 1 1 1 1 1 1 1 1
ozone precursors 1000 t NMVOC equivalents 68 66 62 60 56 52 52 53 58 48
particulate matter 1000 t PM10 equivalents 29 29 27 27 28 27 28 30 34 28
acidifying substances index (1990 = 100) 73 73 65 65 66 63 65 70 79 66
ozone precursors index (1990 = 100) 66 64 60 58 54 51 50 51 56 47
particulate matter index (2000 = 100) 100 101 94 94 97 93 96 103 117 98
2010 2011 2012 2013
acidifying substances 1000 t acid equivalents 1 1 1 1
ozone precursors 1000 t NMVOC equivalents 46 46 45 42
particulate matter 1000 t PM10 equivalents 27 28 28 26
acidifying substances index (1990 = 100) 63 64 63 59
ozone precursors index (1990 = 100) 45 44 44 40
particulate matter index (2000 = 100) 93 95 95 88
Figure PR08-2: Structure of air emissions from transport, Slovenia, 2013
Sources: 

National database on air emissions, Greenhouse gas database, Slovenian Environment Agency, 2015.
Note to Table ZR08-2: Emissions are expressed as * equivalent emissions of PM10 ** NMVOC equivalent, *** acidification equivalent

Show data
particulate matter* ozone precursors** acidifying substances***
NOx 1000 t equiv. (PM10*, NMVOC**, acidif.***) 23.45 32.51 0.58
PM10 1000 t equiv. (PM10*, NMVOC**, acidif.***) 1.89
NH3 1000 t equiv. (PM10*, NMVOC**, acidif.***) 0.28 0.03
SO2 1000 t equiv. (PM10*, NMVOC**, acidif.***) 0.03 0
CO 1000 t equiv. (PM10*, NMVOC**, acidif.***) 3.66
NMVOC 1000 t equiv. (PM10*, NMVOC**, acidif.***) 5.42
CH4 1000 t equiv. (PM10*, NMVOC**, acidif.***) 0
Total 1000 t equiv. (PM10*, NMVOC**, acidif.***) 25.66 41.6 0.61
NOx % 91.41 78.15 95.41
PM10 % 7.36
NH3 % 1.1 4.29
SO2 % 0.13 0.31
CO % 8.81
NMVOC % 13.03
CH4 % 0.01
Figure PR08-3: Air emissions from passenger cars by pollutants, Slovenia, 2008-2013
Sources: 

National database on air emissions, Greenhouse gas database, Slovenian Environment Agency, 2015.

Show data
2008 2009 2010 2011 2012 2013
NOx kt 11 9 9 10 10 9
CO2 kt 3773 3343 3287 3551 3605 3413
PM10 kt 1 1 1 1 1 1
PM2.5 kt 1 1 1 1 1 1
NOx index (2008 = 100) 100 84 82 87 89 84
CO2 index (2008 = 100) 100 89 87 94 96 90
PM10 index (2008 = 100) 100 84 83 87 89 83
PM2.5 index (2008 = 100) 100 82 82 85 87 81

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