Abstract
The presence of Ambrosia sp. pollen is very irregular inSwitzerland. South to the Alps (Ticino), the yearly meanquantities (1993 to 1997) reach 535 pollen grains in Lugano and114 in Locarno. To the West, 205 pollen grains of Ambrosiasp. are observed as yearly mean total in Geneva. In La Chaux-de-Fonds(100 a.s.l.), a yearly mean of 86 pollen is reached, 66 inNeuchâatel, 59 in Payerne and 74 in Basel. In the Swiss RhoneValley, in Visp, this yearly mean reaches 30 pollen ofAmbrosia sp. A little more in the center of the country, inBern, 31 pollen are monitored as yearly mean quantity. In therest of the helvetic territory, in the North and in the East, theyearly mean are below 15 pollen grains. Since 1991–1992, anincrease has been observed essentially in Ticino, in Geneva,Neuchâatel and La Chaux-de-Fonds. The presence of Ambrosiasp. pollen is often noticed in case of strong west or south-westwind flowing, probably coming from the Rhoone Valley and theBresse in France and the Po Valley in Italy.
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