KAZALCI OKOLJA

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The values ​​of biochemical oxygen demand, which is usually an indicator of organic pollution, have significantly decreased in Slovenia since 2005. Average levels of nitrate, orthophosphate and ammonium, which are slightly above background levels, do not show significant changes in the period.



Charts

Figure VD10-1: Average annual concentration of nitrate in rivers (mg N / l) (indicative value for the natural state is 1 mg N / l)
Sources: 

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2011

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1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Slovenia mg N/l 1.25 1.26 1.22 1.25 1.14 1.07 1.18 1.3 1.28 1.33
2006 2007 2008 2009 2010 2011 2012
Slovenia mg N/l 1.4 1.39 1.18 1.41 1.32 1.39 1.31
Figure VD10-2: Average annual concentration of orthophosphate in the rivers (mg P / l) (indicative value for the natural state is 10 mg P / l)
Sources: 

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2011

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1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
orthophosphate mg P/l 0.059 0.048 0.057 0.055 0.047 0.068 0.047 0.045 0.054 0.07
2008 2009 2010 2011 2012
orthophosphate mg P/l 0.031 0.034 0.049 0.049 0.055
Figure VD10-3: Average annual concentration of ammonia (mg N / l) (indicative value for the natural state is 15 mg N / l)
Sources: 

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2011

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1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
Slovenia mg N/l 0.355 0.192 0.263 0.216 0.245 0.332 0.206 0.188 0.187 0.234
2008 2009 2010 2011 2012
Slovenia mg N/l 0.095 0.181 0.166 0.282 0.23
Figure VD10-4: Average annual value of biochemical oxygen demand - BOD5 (mg O 2 /l)
Sources: 

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2011

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1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Slovenia mg O2/l 3.03 3.32 2.67 2.84 2.81 3.76 2.94 3.62 2.61 2.97
2006 2007 2008 2009 2010 2011 2012
Slovenia mg O2/l 1.38 1.47 0.93 1.22 1.48 1.71 1.61



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