| YEARS | CH4 | U(ti) | U'(ti) | NO2 | U(ti) | U'(ti) | OZONE | U(ti) | U'(ti) |
| 2003 | 1733.685 | 0.154 | −0.77 | 5.25E−06 | 3.696 | −1.848 | 0.005655 | 4.466 | −2.618 |
| 2004 | 1729.42 | 1.848 | −0.62 | 4.64E−06 | 2.464 | −0.195 | 0.005602 | 2.926 | −2.464 |
| 2005 | 1729.149 | 0.154 | −0.62 | 4.31E−06 | 1.386 | −1.694 | 0.005479 | 5.389 | −3.542 |
| 2006 | 1722.8 | 2.002 | −0.154 | 4.09E−06 | 3.079 | −1.232 | 0.005629 | 2.772 | −2.772 |
| 2007 | 1734.205 | 1.539 | 0.308 | 3.77E−06 | 0.769 | −0.769 | 0.005566 | 4.004 | −2.156 |
| 2008 | 1736.168 | 0 | −1.694 | 3.83E−06 | 2.926 | −1.078 | 0.005741 | 4.158 | −2.772 |
| 2009 | 1741.963 | 3.079 | −1.232 | 3.75E−06 | 2.156 | −0.616 | 0.005784 | 4.928 | −3.388 |
| 2010 | 1740.801 | −0.154 | −2.309 | 3.82E−06 | 1.848 | −1.848 | 0.005746 | 3.388 | −2.002 |
| 2011 | 1755.575 | 0.769 | 1.078 | 3.94E−06 | 0.154 | −0.616 | 0.005789 | 3.542 | −3.079 |
| 2012 | 1763.733 | 0.616 | −0.616 | 3.98E−06 | 0.769 | −1.848 | 0.00569 | 3.849 | −3.388 |