Table 5.

Temporal variation of air–borne pollen grains trapped on slides (from 9–14 Oct. 1999)

Every 12 h		Every 6 h		Every 2 h
Time (h)	Pollen grains deposited cm–2 (n = 5)	Time (h)	Pollen grains deposited cm–2 (n = 5)	Time (h)	Day 1 Pollen grains deposited cm–2 (n = 5)	Day 2 Pollen grains deposited cm–2 (n = 5)	Day 3 Pollen grains deposited cm–2 (n = 5)	Wind speed (m s–1)
0600	–	0600	–	0600	–	16 ± 0·3	20 ± 0·5	0·06 ± 0·02
1800	215 ± 12·1	1200	87 ± 3·1	0800	15 ± 0·2	12 ± 0·4	12 ± 0·2	0·27 ± 0·09
0600	27 ± 4·2	1800	164 ± 12·3	1000	28 ± 0·7	34 ± 0·4	23 ± 0·3	0·33 ± 0·09
1800	189 ± 14·3	2400	18 ± 1·4	1200	54 ± 4·3	63 ± 2·4	60 ± 1·5	0·45 ± 0·09
0600	21 ± 2·3	0600	10 ± 0·7	1400	74 ± 4·4	84 ± 7·9	123 ± 12·1	1·27 ± 0·15
1800	264 ± 20·1	1200	69 ± 6·4	1600	106 ± 13·1	116 ± 10·8	87 ± 7·2	1·40 ± 0·38
0600	36 ± 6·5	1800	129 ± 10·1	1800	37 ± 1·1	31 ± 1·3	26 ± 0·4	0·36 ± 0·11
1800	249 ± 17·5	2400	17 ± 0·9	2000	17 ± 0·1	12 ± 0·4	10 ± 0·1	0·21 ± 0·08
0600	32 ± 5·1	0600	9 ± 0·3
1800	164 ± 12·3	1200	104 ± 11·6
0600	19 ± 2·2	1800	194 ± 14·8
1800	136 ± 12·1	2400	22 ± 3·4
0600	25 ± 1·6	0600	12 ± 0·9