<p>Data were obtained as the average of the previous n years, from the Comité de Aerobiología-SEAIC (<a href="http://www.polenes.com/concentraciones.html" target="_blank">http://www.polenes.com/concentraciones.html</a>) and from PIA-Punto de información de Aerobiología-UAB (<a href="http://lap.uab.cat/aerobiologia/" target="_blank">http://lap.uab.cat/aerobiologia/</a>).</p>*<p>Average of pollen counts (grains/m<sup>3</sup>). The time period is indicated in brackets.</p
