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Although the measurement of airborne pollen allergen concentrations in outdoor environments (namely, in urban areas) has been recognized as a\u00a0key environmental health indicator, no such obligation exists for indoor environments (dwellings or occupational settings). However, people spend most of their daily time (80\u201390%) indoors, where the majority of their exposure to air pollution, including pollen allergens, occurs. Nonetheless, the relative importance of airborne pollen allergen exposure indoors differs from outdoors because of differences in pollen loads, sources, dispersion, and degree of penetration from the outdoor surroundings, as well as the differences in the allergenic pollen profiles. In this brief review, we mined the literature over the last 10\u00a0years to summarize what existing measurements reveal about the relevance of airborne allergenic pollen in indoor environments. The research priorities on this topic are presented, highlighting the challenges and the motivations for obtaining pollen data in built environments which are key to understand the extent and mechanisms of human exposure to airborne pollen allergens. Thus, we provide a comprehensive assessment of the relevance of airborne allergenic pollen in indoor environments, highlighting knowledge gaps and research needs related to their health effects.<\/jats:p>","DOI":"10.1007\/s40629-023-00251-y","type":"journal-article","created":{"date-parts":[[2023,6,13]],"date-time":"2023-06-13T09:01:51Z","timestamp":1686646911000},"page":"167-175","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Assessing the relevance of allergenic pollen in indoor environments\u2014current knowledge base and research needs"],"prefix":"10.1007","volume":"32","author":[{"given":"Sascha","family":"Nehr","sequence":"first","affiliation":[]},{"given":"Regina M. B. 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