Alcalá de Henares — March 1998

2,356 London Plane — day 21

1,840 London Plane — day 20

1,396 London Plane — day 22

31 Days measured

Daily pollen level evolution
Day	Cypress/Yew	London Plane	Grasses	Plantain	Olive
1	173 (High)	0 (Low)	16 (Low)	0 (Low)	0 (Low)
2	50 (Medium)	0 (Low)	3 (Low)	0 (Low)	0 (Low)
3	12 (Low)	0 (Low)	2 (Low)	0 (Low)	0 (Low)
4	18 (Low)	0 (Low)	2 (Low)	0 (Low)	0 (Low)
5	60 (Medium)	0 (Low)	2 (Low)	0 (Low)	0 (Low)
6	20 (Low)	0 (Low)	7 (Low)	0 (Low)	0 (Low)
7	61 (Medium)	0 (Low)	6 (Low)	0 (Low)	0 (Low)
8	116 (High)	1 (Low)	4 (Low)	0 (Low)	0 (Low)
9	23 (Low)	0 (Low)	5 (Low)	0 (Low)	0 (Low)
10	4 (Low)	3 (Low)	4 (Low)	0 (Low)	0 (Low)
11	20 (Low)	3 (Low)	2 (Low)	0 (Low)	0 (Low)
12	12 (Low)	4 (Low)	1 (Low)	0 (Low)	0 (Low)
13	2 (Low)	4 (Low)	1 (Low)	0 (Low)	0 (Low)
14	2 (Low)	13 (Low)	1 (Low)	1 (Low)	0 (Low)
15	3 (Low)	54 (Medium)	0 (Low)	0 (Low)	0 (Low)
16	1 (Low)	66 (Medium)	2 (Low)	0 (Low)	0 (Low)
17	1 (Low)	109 (High)	4 (Low)	0 (Low)	0 (Low)
18	4 (Low)	229 (High)	0 (Low)	0 (Low)	0 (Low)
19	11 (Low)	563 (Very high)	5 (Low)	0 (Low)	0 (Low)
20	12 (Low)	1,840 (Very high)	6 (Low)	1 (Low)	0 (Low)
21	12 (Low)	2,356 (Very high)	9 (Low)	0 (Low)	0 (Low)
22	15 (Low)	1,396 (Very high)	14 (Low)	1 (Low)	0 (Low)
23	5 (Low)	682 (Very high)	5 (Low)	2 (Low)	0 (Low)
24	3 (Low)	724 (Very high)	7 (Low)	0 (Low)	0 (Low)
25	2 (Low)	278 (High)	0 (Low)	1 (Low)	0 (Low)
26	0 (Low)	385 (Very high)	3 (Low)	0 (Low)	0 (Low)
27	2 (Low)	275 (High)	4 (Low)	0 (Low)	0 (Low)
28	19 (Low)	393 (Very high)	1 (Low)	0 (Low)	0 (Low)
29	0 (Low)	76 (Medium)	0 (Low)	0 (Low)	0 (Low)
30	1 (Low)	113 (High)	6 (Low)	1 (Low)	0 (Low)
31	2 (Low)	66 (Medium)	10 (Low)	2 (Low)	1 (Low)