year PM10 SO2 O3 NO2
2001 26.8 1.0 31.4 13.9
2002 27.6 1.0 21.5 16.5
2003 43.8 0.6 64.5 23.1
2004 25.3 0.8 20.3 17.2
2005 36.0 0.5 26.9 16.2
2006 41.2 2.2 49.3 9.4
2007 28.8 0.4 22.0 13.9
2008 19.9 0.3 15.7 6.8
2009 22.3 0.1 17.7 12.9
2010 23.5 0.0 18.4 7.4
2011 32.7 0.0 13.6 4.9