">(</span><span class="st">"air"</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div id="format">
    <h2>Format</h2>
    <p>A list of 7 matrices with 355 rows and 24 columns:</p><dl><dt>NO2</dt>
<dd><p>Hourly observation of concentration level of NO2 in 355 days</p></dd>

  <dt>CO</dt>
<dd><p>Hourly observation of concentration level of CO in 355 days</p></dd>

  <dt>NMHC</dt>
<dd><p>Hourly observation of concentration level of NMHC in 355 days</p></dd>

  <dt>NOx</dt>
<dd><p>Hou