Alcalá de Henares — April 1997

113 London Plane — day 1

73 London Plane — day 3

68 London Plane — day 4

27 Days measured

Daily pollen level evolution
Day	Cypress/Yew	London Plane	Grasses	Plantain	Olive
1	5 (Low)	113 (High)	2 (Low)	2 (Low)	0 (Low)
2	4 (Low)	46 (Medium)	5 (Low)	4 (Low)	0 (Low)
3	9 (Low)	73 (Medium)	5 (Low)	1 (Low)	1 (Low)
4	7 (Low)	68 (Medium)	3 (Low)	0 (Low)	0 (Low)
5	3 (Low)	15 (Low)	2 (Low)	0 (Low)	0 (Low)
6	8 (Low)	36 (Medium)	3 (Low)	0 (Low)	1 (Low)
7	—	—	—	—	—
8	—	—	—	—	—
9	2 (Low)	10 (Low)	2 (Low)	0 (Low)	0 (Low)
10	1 (Low)	2 (Low)	1 (Low)	0 (Low)	0 (Low)
11	2 (Low)	2 (Low)	2 (Low)	2 (Low)	0 (Low)
12	25 (Low)	6 (Low)	2 (Low)	2 (Low)	0 (Low)
13	18 (Low)	3 (Low)	4 (Low)	3 (Low)	0 (Low)
14	9 (Low)	2 (Low)	2 (Low)	1 (Low)	1 (Low)
15	1 (Low)	0 (Low)	3 (Low)	2 (Low)	1 (Low)
16	17 (Low)	2 (Low)	5 (Low)	6 (Low)	6 (Low)
17	9 (Low)	4 (Low)	4 (Low)	7 (Low)	18 (Low)
18	12 (Low)	1 (Low)	4 (Low)	0 (Low)	4 (Low)
19	2 (Low)	1 (Low)	0 (Low)	1 (Low)	3 (Low)
20	0 (Low)	0 (Low)	0 (Low)	0 (Low)	0 (Low)
21	5 (Low)	2 (Low)	2 (Low)	1 (Low)	0 (Low)
22	2 (Low)	0 (Low)	0 (Low)	1 (Low)	0 (Low)
23	4 (Low)	0 (Low)	7 (Low)	9 (Low)	4 (Low)
24	1 (Low)	0 (Low)	8 (Low)	6 (Low)	48 (Low)
25	1 (Low)	0 (Low)	4 (Low)	6 (Low)	32 (Low)
26	1 (Low)	0 (Low)	5 (Low)	6 (Low)	42 (Low)
27	4 (Low)	0 (Low)	4 (Low)	4 (Low)	24 (Low)
28	2 (Low)	0 (Low)	2 (Low)	10 (Low)	0 (Low)
29	37 (Medium)	0 (Low)	2 (Low)	4 (Low)	4 (Low)
30	—	—	—	—	—