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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 2012 road transport contributed 53% to the total emissions of nitrogen oxides. Emissions of substances that cause acidification in the period 1990-2012 reduced by 36%, emissions of ozone precursors by 56%. Emissions of particulate matter in the period 2000-2012 decreased by 4%.


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, 1990-2012
Sources: 

National database on air emissions, Greenhouse gas database, Slovenian Environment Agency, 2014.

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 100 91 88 95 98 99 105 97 81 70
particulate matter 1000 t PM10 equivalents
acidifying substances index (1990 = 100) 100 94 90 97 104 89 96 94 80 72
ozone precursors index (1990 = 100) 100 92 88 95 99 99 105 98 81 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 66 64 60 58 53 50 49 50 55 47
particulate matter 1000 t PM10 equivalents 28 28 26 26 27 25 26 28 33 27
acidifying substances index (1990 = 100) 73 73 64 64 66 62 64 69 79 66
ozone precursors index (1990 = 100) 66 64 60 58 53 50 49 50 56 47
particulate matter index (2000 = 100) 100 101 93 93 96 91 94 102 118 98
2010 2011 2012
acidifying substances 1000 t acid equivalents 1 1 1
ozone precursors 1000 t NMVOC equivalents 44 45 44
particulate matter 1000 t PM10 equivalents 26 27 27
acidifying substances index (1990 = 100) 63 64 64
ozone precursors index (1990 = 100) 45 45 44
particulate matter index (2000 = 100) 94 96 96
Figure PR08-2: Structure of air emissions from transport, Slovenia, 2012
Sources: 

National database on air emissions, Greenhouse gas database, Slovenian Environment Agency, 2014.
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.***) 24.5 33.96 0.61
PM10 1000 t equiv. (PM10*, NMVOC**, acidif.***) 1.9
NH3 1000 t equiv. (PM10*, NMVOC**, acidif.***) 0.33 0.03
SO2 1000 t equiv. (PM10*, NMVOC**, acidif.***) 0.03 0
CO 1000 t equiv. (PM10*, NMVOC**, acidif.***) 4.1
NMVOC 1000 t equiv. (PM10*, NMVOC**, acidif.***) 5.67
CH4 1000 t equiv. (PM10*, NMVOC**, acidif.***) 0.01
Total 1000 t equiv. (PM10*, NMVOC**, acidif.***) 26.76 43.73 0.64
NOx % 91.54 77.66 94.99
PM10 % 7.12
NH3 % 1.22 4.72
SO2 % 0.12 0.29
CO % 9.36
NMVOC % 12.97
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, 2014.

Show data
2008 2009 2010 2011 2012 2013
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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