Abstract
Pollen counts in Burgundy were monitored by means of four Hirst volumetric traps. Their analysis revealed a sharp rise of Ambrosia from 1996 to 1997. The minimum amount of ragweed pollen likely to provoke allergies (13 grains m−3) was reached or exceeded several days every year, but without leading to clinical symptoms. The circadian variation of Ambrosia pollen showed two peaks: the first one in the morning was suggested to coincide with local pollination, although the second one, in the afternoon, seemed to result from a long range transport which was confirmed by the study of wind roses.
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Laaidi, K., Laaidi, M. Airborne pollen of Ambrosia in Burgundy (France) 1996–1997. Aerobiologia 15, 65–69 (1999). https://doi.org/10.1023/A:1007547919559
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DOI: https://doi.org/10.1023/A:1007547919559