L. Lőkös szerk.: Studia Botanica Hungarica 24. 1993 (Budapest, 1993)
Járainé Komlódi, Magda; Medzihradszky, Zsófia: Aeropollen research in the air of Budapest in 1992
3 Fig. 1. Pollen calendar of the trees (pollen per m air - seven-day averages) pollen peaks, one in May, and one at the end of June —beginning of July (Fig. 2). In 1992 we registered a total number of 1924 grass pollen, compared to 896 measured in 1991. In July, when the weeds start flowering, there is a higher quantity of pollen in the air. Though the threshold value, 30/m 3 , was not reached, the pollen of Rumex and Plantago was continuously present in the air. In 1992 an allergenic quantity of Urtica and Cannabis was observed, and there was a great amount from members of the Chenopodiaceae and Amaranthaceae. The main flowering, and thus the pollen peaks of the two most dangerous weeds, namely Artemisia and Ambrosia follow each other with a shift of a few days. Considering the data of 1991, both of them appeared earlier and in a higher amount this year. The pollen number of Artemisia was nearly threefold, that of Ambrosia fivefold. Both of them are very allergenic, air pollinated, their pollen production is high. (Out of the 11,229 weed pollen 7424 were of Ambrosia and Artemisia). They reinforce each other's allergenic effect. Both are present in the air for a number of months, up to the first frosts (Fig. 3). Fig. 2. Pollen calendar of the grasses (pollen per m 3 air - seven-day averages)
