Alcalá de Henares — March 1999

6,652 London Plane — day 31

3,274 London Plane — day 30

643 Cypress/Yew — day 3

28 Days measured

Daily pollen level evolution
Day	Cypress/Yew	London Plane	Grasses	Plantain	Olive
1	160 (High)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
2	346 (Very high)	0 (Low)	7 (Low)	0 (Low)	0 (Low)
3	643 (Very high)	0 (Low)	8 (Low)	0 (Low)	0 (Low)
4	157 (High)	0 (Low)	2 (Low)	0 (Low)	0 (Low)
5	37 (Medium)	0 (Low)	0 (Low)	0 (Low)	0 (Low)
6	9 (Low)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
7	10 (Low)	0 (Low)	4 (Low)	0 (Low)	0 (Low)
8	218 (Very high)	0 (Low)	3 (Low)	0 (Low)	0 (Low)
9	236 (Very high)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
10	116 (High)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
11	207 (Very high)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
12	36 (Medium)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
13	—	—	—	—	—
14	58 (Medium)	0 (Low)	0 (Low)	0 (Low)	0 (Low)
15	28 (Low)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
16	39 (Medium)	0 (Low)	1 (Low)	0 (Low)	0 (Low)
17	106 (High)	0 (Low)	6 (Low)	0 (Low)	0 (Low)
18	51 (Medium)	0 (Low)	2 (Low)	0 (Low)	0 (Low)
19	—	—	—	—	—
20	—	—	—	—	—
21	3 (Low)	4 (Low)	1 (Low)	0 (Low)	0 (Low)
22	27 (Low)	40 (Medium)	2 (Low)	0 (Low)	0 (Low)
23	8 (Low)	25 (Low)	0 (Low)	0 (Low)	0 (Low)
24	5 (Low)	60 (Medium)	0 (Low)	0 (Low)	0 (Low)
25	55 (Medium)	47 (Medium)	1 (Low)	0 (Low)	0 (Low)
26	26 (Low)	33 (Medium)	1 (Low)	0 (Low)	0 (Low)
27	63 (Medium)	40 (Medium)	3 (Low)	0 (Low)	0 (Low)
28	10 (Low)	211 (High)	0 (Low)	0 (Low)	0 (Low)
29	5 (Low)	538 (Very high)	1 (Low)	0 (Low)	0 (Low)
30	4 (Low)	3,274 (Very high)	5 (Low)	2 (Low)	0 (Low)
31	11 (Low)	6,652 (Very high)	0 (Low)	1 (Low)	0 (Low)