Abstract
Pollen grains are released from plants and rupture, releasing pollen grain fragments referred to as subpollen particles (SPPs). This study is a laboratory evaluation of live oak, Quercus virginiana, to determine the environmental conditions needed to emit SPPs and measure the concentration of SPPs produced. To represent conventional SPP release, live oak branches were exposed to high relative humidity (> 95%), followed by reduced relative humidity (73.5%-76.3%) and wind (up to 1.8 m s−1). In contrast, wind-driven SPP release experiments were conducted by exposing branches to constant relative humidity while cycling fans used to simulate winds. Wind-driven experiments produced maximum SPP concentrations as high as 3.3 × 102 ± 2.7 × 102 SPPs per cm3. The maximum SPP emissions during conventional SPP release experiments were as high as 7.3 × 101 ± 3.4 × 101 SPPs per cm3. The total number of SPPs emitted during conventional SPP release experiments was not significantly different from the SPP emissions during wind-driven SPP release experiments at a 5% significance level. The concentration of SPPs generated from pollen grains was used to calculate SPP emission factors. SPP emission factors were determined to be between 1.6 × 104 and 9.0 × 104 SPPs per pollen grain and between 4.7 × 1012 and 2.2 × 1015 SPPs per m2. These results indicate that SPPs represent a significant source of cloud-forming aerosol and have the ability to impact respiratory health.
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This research was supported by the National Science Foundation Collaborative Grant #AGS-1821095. We thank our collaborators Allison Steiner and Yingxiao Zhang at the University of Michigan for insightful discussions. Elizabeth Mentis is thanked for assistance with editing and preparing manuscript for submission.
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The funding was provided by National Science Foundation,#AGS-1821095,Sarah D. Brooks
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SDB conceived of the project. BNH and SDB contributed to the writing of the manuscript. Material preparation, data collection, and analysis were led by BNH with assistance from ANA. All authors read and approved the final manuscript.
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Hendrickson, B.N., Alsante, A.N. & Brooks, S.D. Live oak pollen as a source of atmospheric particles. Aerobiologia 39, 51–67 (2023). https://doi.org/10.1007/s10453-022-09773-4
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DOI: https://doi.org/10.1007/s10453-022-09773-4