tant_unit</td>
<td align="left">keyword</td>
</tr>
<tr class="odd">
<td align="left">resource_uuid</td>
<td align="left">resource_uuid</td>
<td align="left">keyword</td>
</tr>
</tbody>
</table>
<p>We accordingly select the <strong>city</strong> and
<strong>pollution_id</strong> fields for constructing our query. Note
that we use only field id to finally query the data.</p>
<div class="sourceCode" id="cb14"><pre class="downlit sourceCode r">
<code class="sourceCode R">
<span class="fu"><a href="../reference/