Table 3. Pollen counts (grains/m3 of air) of the regions included in the study.
| Region Pollen* | Alicante (2001–2011) | Barcelona (2001–2011) | Bilbao (2001–2011) | Canary I. (2008–2011) | Madrid (2001–2011) | Málaga (1995–1999) | Ourense (1996–1999) |
| Grass | – | – | – | – | 200 | – | – |
| Birch | – | – | 100 | – | – | – | 120 |
| Plane | – | 1800 | – | – | 1050 | 225 | – |
| Oak | – | 375 | 330 | – | 520 | – | 100 |
| Pine | 375 | 200 | 620 | 100 | 160 | – | 130 |
| Cypress | 175 | 525 | – | – | 200 | 250 | 470 |
| Mugwort | – | – | – | 150 | – | – | – |
| Pellitory | – | – | – | 110 | – | – | – |
| Olive | 355 | 125 | – | – | 473 | 1250 | – |
| Palm | 220 | – | – | – | – | – |
Data were obtained as the average of the previous n years, from the Comité de Aerobiología-SEAIC (http://www.polenes.com/concentraciones.html) and from PIA-Punto de información de Aerobiología-UAB (http://lap.uab.cat/aerobiologia/).
*
Average of pollen counts (grains/m3). The time period is indicated in brackets.