Collado Villalba — 1999 Next
| Month | Cypress/Yew | London Plane | Grasses | Plantain | Olive | Birch | Privet | Alder | Mugwort | Chestnut | Composites | Hazel | Heather | Eucalyptus | Ash | Mulberry | Elm | Pine | Poplar | Goosefoot/Am | Oak | Sorrel | Willow | Nettle | Unidentified |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| January | 1.798 | 0 | 4 | 0 | 0 | 0 | 0 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 228 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 |
| February | 2.284 | 0 | 32 | 0 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 3 | 0 | 0 | 299 | 0 | 10 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| March | 577 | 14 | 3 | 0 | 0 | 4 | 0 | 5 | 0 | 0 | 0 | 3 | 0 | 0 | 10 | 0 | 19 | 7 | 64 | 0 | 14 | 14 | 3 | 0 | 0 |
| April | 30 | 140 | 38 | 10 | 0 | 48 | 0 | 0 | 0 | 0 | 1 | 0 | 7 | 0 | 0 | 137 | 4 | 58 | 33 | 0 | 363 | 6 | 0 | 7 | 20 |
| May | 35 | 0 | 134 | 45 | 947 | 0 | 1 | 0 | 0 | 3 | 9 | 0 | 7 | 0 | 0 | 25 | 0 | 152 | 0 | 15 | 1.103 | 36 | 0 | 40 | 58 |
| June | 43 | 0 | 88 | 23 | 72 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 4 | 0 | 0 | 1 | 0 | 138 | 0 | 13 | 100 | 32 | 0 | 5 | 37 |
| July | 6 | 2 | 47 | 3 | 13 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | 4 | 8 | 10 | 0 | 1 | 16 |
| August | 1 | 0 | 5 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 11 | 0 | 0 | 0 | 2 | 0 | 9 | 3 | 2 | 0 | 0 | 7 |
| September | 0 | 0 | 5 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 17 | 0 | 1 | 0 | 4 | 0 | 6 | 2 | 0 | 0 | 0 | 5 |
| October | 18 | 0 | 2 | 2 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 1 | 1 | 1 | 0 | 0 | 2 |
| November | 8 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0 | 3 | 1 | 0 | 6 | 2 |
| December | 35 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 3 |