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Indoor pollen concentrations of mountain cedar (Juniperus ashei) during rainy episodes in Austin, Texas


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Jochner-Oette, Susanne ; Jetschni, Johanna ; Liedl, Petra ; Menzel, Annette:
Indoor pollen concentrations of mountain cedar (Juniperus ashei) during rainy episodes in Austin, Texas.
In: International journal of environmental research and public health. 19 (2022) 3: 1541. - 11 S.
ISSN 1660-4601


Open Access
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Standard pollen monitoring programs evaluate outdoor pollen concentrations; however, information on indoor pollen is crucial for human wellbeing as people spend most of the day in indoor environments. In this study, we investigated the differences in indoor mountain cedar pollen loads between rooms of different uses and with different ventilation at The University of Texas in Austin and focused on the effect of rainy episodes on indoor/outdoor ratios of pollen concentrations. Pollen were sampled outdoors and indoors, specifically in seven rooms and in two thermal labs with controlled ventilation, during the daytime on 6 days in 2015. We calculated daily pollen concentrations, campaign pollen integrals (CPIn, the sum of all daily pollen concentrations) and ratios between indoor and outdoor concentrations (I/O ratio). Pollen concentrations differed substantially based on features related to room use and ventilation: Whereas the highest CPIn was observed in a room characterized by a frequently opened window and door, the smallest CPIn was related to a storeroom without any windows and no forced ventilation. Our results showed that rainy episodes were linked to a higher mean I/O ratio (0.98; non-rainy episodes: 0.05). This suggests that pollen accumulated indoors and reached higher levels than outdoors. Low ratios seem to signal a low level of risk for allergic people when staying inside. However, under very high outdoor pollen concentrations, small ratios can still be associated with high indoor pollen levels. In turn, high I/O ratios are not necessarily related to a (very) high indoor exposure. Therefore, I/O ratios should be considered along with pollen concentration values for a proper risk assessment. Exposure may be higher in indoor environments during prevailing precipitation events and at the end of the pollen season of a specific species. Standardized indoor environments (e.g., thermal labs) should be included in pollen monitoring programs.

Weitere Angaben

Schlagwörter:indoor pollen; mountain cedar; personal volumetric air samplers; thermal labs; ventilation
Sprache des Eintrags:Englisch
Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Professur für Physische Geographie/Landschaftsökologie und nachhaltige Ökosystementwicklung
DOI / URN / ID:10.3390/ijerph19031541
Open Access: Freie Zugänglichkeit des Volltexts?:Ja
Verlag:MDPI AG
Die Zeitschrift ist nachgewiesen in:
Titel an der KU entstanden:Ja
Eingestellt am: 02. Feb 2022 11:14
Letzte Änderung: 02. Feb 2022 20:14
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