A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Comparison of pollen indoor/outdoor ratios during off-peak and peak periods in Japan
https://orcid.org/0000-0002-5800-6435
https://orcid.org/0000-0003-3709-4517
https://orcid.org/0000-0002-2317-6012
Abstract Outdoor pollen particles can invade indoor spaces through various pathways, causing hay fever. This study aimed to investigate the effect of pollen diameter and shape on indoor invasion ratio (indoor/outdoor [I/O] ratio) during off-peak and peak pollen periods as well as the pollen types that easily invade indoor spaces. The measurement site was located in an apartment in Tokyo, Japan. Daily pollen sampling was performed from November 2021 to May 2022. The I/O ratios were analyzed for six pollen diameter ranges (0–2.5 μm, 2.5−10 μm, 10−20 μm, 20−30 μm, 30−40 μm, and >40 μm), four pollen shapes (monomer, ruptured, agglomerate, and unknown pollen), and 14 pollen types. The results showed that the total I/O ratio per day during the peak pollen period (0−2.8) was larger than during the off-peak period (0−1.2). The highest I/O ratio values (mean: 0.68, median: 0.47) were observed for pollen >40 μm in diameter during the off-peak period. Regarding their shape, the highest I/O ratio values (mean: 0.70, median: 0.28) were observed for ruptured pollen during the peak period. The most abundant pollen types were Corynespora (off-peak period) and Japanese cedar (peak period) indoors.
Highlights The total pollen I/O ratio per day is in the range of 0–1.2 (off-peak) and 0–2.8 (peak). The highest mean I/O ratio was observed for pollen >40 μm in diameter (off-peak). Ruptured pollen was observed the highest mean I/O ratios (peak). During the peak period, Japanese cedar pollen was observed in the largest amount.
Comparison of pollen indoor/outdoor ratios during off-peak and peak periods in Japan
https://orcid.org/0000-0002-5800-6435
https://orcid.org/0000-0003-3709-4517
https://orcid.org/0000-0002-2317-6012
Abstract Outdoor pollen particles can invade indoor spaces through various pathways, causing hay fever. This study aimed to investigate the effect of pollen diameter and shape on indoor invasion ratio (indoor/outdoor [I/O] ratio) during off-peak and peak pollen periods as well as the pollen types that easily invade indoor spaces. The measurement site was located in an apartment in Tokyo, Japan. Daily pollen sampling was performed from November 2021 to May 2022. The I/O ratios were analyzed for six pollen diameter ranges (0–2.5 μm, 2.5−10 μm, 10−20 μm, 20−30 μm, 30−40 μm, and >40 μm), four pollen shapes (monomer, ruptured, agglomerate, and unknown pollen), and 14 pollen types. The results showed that the total I/O ratio per day during the peak pollen period (0−2.8) was larger than during the off-peak period (0−1.2). The highest I/O ratio values (mean: 0.68, median: 0.47) were observed for pollen >40 μm in diameter during the off-peak period. Regarding their shape, the highest I/O ratio values (mean: 0.70, median: 0.28) were observed for ruptured pollen during the peak period. The most abundant pollen types were Corynespora (off-peak period) and Japanese cedar (peak period) indoors.
Highlights The total pollen I/O ratio per day is in the range of 0–1.2 (off-peak) and 0–2.8 (peak). The highest mean I/O ratio was observed for pollen >40 μm in diameter (off-peak). Ruptured pollen was observed the highest mean I/O ratios (peak). During the peak period, Japanese cedar pollen was observed in the largest amount.
Comparison of pollen indoor/outdoor ratios during off-peak and peak periods in Japan
https://orcid.org/0000-0002-5800-6435
https://orcid.org/0000-0003-3709-4517
https://orcid.org/0000-0002-2317-6012
Abstract Outdoor pollen particles can invade indoor spaces through various pathways, causing hay fever. This study aimed to investigate the effect of pollen diameter and shape on indoor invasion ratio (indoor/outdoor [I/O] ratio) during off-peak and peak pollen periods as well as the pollen types that easily invade indoor spaces. The measurement site was located in an apartment in Tokyo, Japan. Daily pollen sampling was performed from November 2021 to May 2022. The I/O ratios were analyzed for six pollen diameter ranges (0–2.5 μm, 2.5−10 μm, 10−20 μm, 20−30 μm, 30−40 μm, and >40 μm), four pollen shapes (monomer, ruptured, agglomerate, and unknown pollen), and 14 pollen types. The results showed that the total I/O ratio per day during the peak pollen period (0−2.8) was larger than during the off-peak period (0−1.2). The highest I/O ratio values (mean: 0.68, median: 0.47) were observed for pollen >40 μm in diameter during the off-peak period. Regarding their shape, the highest I/O ratio values (mean: 0.70, median: 0.28) were observed for ruptured pollen during the peak period. The most abundant pollen types were Corynespora (off-peak period) and Japanese cedar (peak period) indoors.
Highlights The total pollen I/O ratio per day is in the range of 0–1.2 (off-peak) and 0–2.8 (peak). The highest mean I/O ratio was observed for pollen >40 μm in diameter (off-peak). Ruptured pollen was observed the highest mean I/O ratios (peak). During the peak period, Japanese cedar pollen was observed in the largest amount.
Comparison of pollen indoor/outdoor ratios during off-peak and peak periods in Japan
Wang, Wenchao (author) / Ooka, Ryozo (author) / Kikumoto, Hideki (author) / Oh, Wonseok (author) / Han, Mengtao (author)
Building and Environment ; 246
2023-11-03
Article (Journal)
Electronic Resource
English
Relationship between indoor air microbial peak values and outdoor climatic conditions
| British Library Conference Proceedings | 2000
On the distribution of significant wave height and associated peak periods
| Online Contents | 2015