Year PM10 SO2 O3 NO2
2002 84.9 80.8 97.7 16.5
2003 92.8 76.6 98.9 23.1
2004 81.7 69.5 99.7 17.2
2005 84.6 67.6 97.0 16.2
2006 87.8 72.7 99.0 9.4
2007 89.8 61.2 98.5 13.9
2008 78.2 57.1 99.0 6.8
2009 84.7 54.4 98.1 12.9
2010 86.9 52.5 96.8 7.4
2011 87.8 45.5 97.8 4.9