5.3.23. Trends of regional background concentrations of some air pollutants (1990–)*

(µg/m³)

< >
Year Sulphur-dioxide (SO2) Nitrogen-dioxide (NO2) Ammonia (NH3) Nitric acid (HNO3)
K-pusztaa Farkasfa Nyírjes K-pusztaa Farkasfa Nyírjes K-pusztaa
1990 5.5 .. .. 8.1 .. .. 1.2 2.2
1995 ..b .. .. ..b .. .. 0.9 1.9
1996 5.5 .. .. 6.5 .. .. 0.8 1.4
1997 10.6 .. .. 8.3 .. .. 1.4 1.9
1998 8.3 4.9 17.3 5.9 6.5 2.6 1.0 1.1
1999 6.8 3.6 19.6 5.7 7.4 2.8 1.1 1.3
2000 5.7 2.5 16.6 5.3 4.7 4.8 ..c 1.2
2001 5.1 2.1 9.4 5.7 6.5 3.6 ..c 1.0
2002 4.4 2.2 8.0 5.4 6.4 2.9 0.5 0.9
2003 4.8 2.3 6.2 5.5 6.3 2.5 1.7 1.2
2004 3.4 1.5 4.5 5.0 5.1 .. 1.3 0.9
2005 2.3 ..d 3.0 4.6 ..d 2.8 1.7 1.1
2006 1.8 ..d 3.0 5.9 ..d 3.0 1.5 0.8
2007 1.4 0.8 2.3 5.2 4.7 2.7 1.6 0.9
2008 2.8 1.0 2.5 6.2 4.6 2.9 1.9 1.4
2009 2.7 1.3 3.1 6.2 4.1 2.7 1.6 1.3
2010 2.4 1.0 2.3 7.5 4.0 2.4 1.3 1.6
2011 2.7 0.9 3.5 7.2 4.0 2.6 1.6 1.4
*Source: Hungarian Meteorological Service.  aDenomination of the monitoring station near Kecskemét.  bThe data unacceptable by subsequent examinations, since then the measurement methode has been changed.  cDue to technical reasons (not enough measurements) data are not available.  dAt Farkasfa station measurements were temporarily stopped between 2005 and 2006. 

© Hungarian Central Statistical Office, 2011