Author/Editor		Kofol-Seliger, Andreja; Cegnar, Tanja; Sušnik, Andreja
Title		Meritve koncentracije cvetnega prahu v Ljubljani
Translated title		Measurements of pollen concentration in Ljubljana
Type		članek
Source		Meseč Bilt - Hidrometeorol Zavod R Slov
Vol. and No.		Letnik 5, št. 4
Publication year		1998
Volume		str. 49-53
Language		slo
Abstract		Birch pollen is besides grass pollen the most important cause of polinosis in the central Slovenia. In 1998 the birch pollen started to appear in the at the end of March and persisted through the whole April. The daily concentration peaked on 4 April. It happened two days before as last year and 22 days before as in 1996. Daily concentration of maple, birch, hornbeam, willow, ash and pine pollen in April 1996, 1997 and 1998 are presented on Figure 5.1. The pollen of cypress family, willow and pine was present all April in the air. The maple pollen counts were peaked at the beginning of April. Hornbeam started to bloom in March. The peak counts of the pollen were in the first and in the last decade. Plane tree and beech pollen was observed in the last decade of April. The peak counts of plane pollen was on 26 April. Its airborne season was short and lasted approximately two weeks. On the last four days of April the grass pollen started to appear in very small concentrations. The daily counts of pollen were low in the middle of the month, from 12 to 19 April, and at the end of the month (Figure 5.2, Figure 5.3), due to unfavourable weather conditions. In the major part of Slovenia in the present year a birch-tree started to blossom in the first decade of April. In Gorenjska, koroaka and Notranjska regions and at the higher altitudes blossoming started at the end of second and at the beginning of third decade of April (Figure 5.6.). Compared with the longterm average this year's appearance of blossoms by birch-tree was six to ten days earlier. Only at the exposed stations there was no big difference with the average (Ilirska Bistrica, Grad-Cerklje, Lesce, Zgornje Bitnje). At the warmer locations the blossoming time of the ash-tree is usually observed in the first days of April (Kadrenci, Tolmin, Murska Sobora, Ljubljana) while in the Primorska region blossoms as early as after Marc 20.(Abstract truncated at 2000 characters.)
Descriptors		AIR POLLUTANTS POLLEN SEASONS TREES