Previous Collado Villalba — 2026
| Month | Cypress/Yew | London Plane | Grasses | Plantain | Olive |
|---|---|---|---|---|---|
| January | 526 | 0 | 2 | 0 | 0 |
| February | 457 | 0 | 3 | 0 | 1 |
| March | 500 | 32 | 14 | 1 | 0 |
| April | 11 | 229 | 9 | 4 | 6 |
| May | 5 | 0 | 65 | 31 | 63 |
| June | — | — | — | 15 | 18 |
| July | — | — | — | 1 | 1 |
| August | — | — | — | — | — |
| September | — | — | — | — | — |
| October | — | — | — | — | — |
| November | — | — | — | — | — |
| December | — | — | — | — | — |