Collado Villalba — 1999 Next
| Month | Cypress/Yew | London Plane | Grasses | Plantain | Olive |
|---|---|---|---|---|---|
| January | 1.798 | 0 | 4 | 0 | 0 |
| February | 2.284 | 0 | 32 | 0 | 0 |
| March | 577 | 14 | 3 | 0 | 0 |
| April | 30 | 140 | 38 | 10 | 0 |
| May | 35 | 0 | 134 | 45 | 947 |
| June | 43 | 0 | 88 | 23 | 72 |
| July | 6 | 2 | 47 | 3 | 13 |
| August | 1 | 0 | 5 | 6 | 2 |
| September | 0 | 0 | 5 | 2 | 1 |
| October | 18 | 0 | 2 | 2 | 0 |
| November | 8 | 0 | 1 | 0 | 0 |
| December | 35 | 0 | 2 | 1 | 0 |