| Year | PM2.5 | PM10 | O3 | NO2 |
|---|---|---|---|---|
| 2000 | 86.3 | 93.2 | 21.4 | |
| 2001 | 84.3 | 96.3 | 18.4 | |
| 2002 | 81.5 | 97.1 | 20.9 | |
| 2003 | 91.9 | 97.8 | 27.2 | |
| 2004 | 80.0 | 99.0 | 19.7 | |
| 2005 | 83.3 | 96.5 | 20.3 | |
| 2006 | 97.8 | 87.0 | 98.6 | 17.7 |
| 2007 | 92.7 | 85.2 | 97.8 | 19.4 |
| 2008 | 87.2 | 73.1 | 98.6 | 11.8 |
| 2009 | 91.0 | 75.8 | 97.2 | 14.9 |
| 2010 | 91.4 | 77.3 | 95.0 | 13.1 |
| 2011 | 93.1 | 83.1 | 97.1 | 11.9 |
| 2012 | 91.7 | 63.8 | 97.8 | 8.0 |