Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Environmental issues in Pristina
Table title:
Gases
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Nitrogen dioxide (NO2)-annual average for 2010 and 2011 </th><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > 2011 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Annual average value limit for protection of materials </td><td class="highlighted"  colspan=2 rowspan=1 > 40 µg/m3 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Pristina-KHMI </td><td class="highlighted"  colspan=1 rowspan=1 > 20.82 </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
 What is the Nitrogen dioxide (NO2)-annual average for 2010 and 2011?
Answer:
The annual average value limit of NO2 is 40 µg/m3 and the Pristina was 20.82 µg/m3 in 2010.