This study investigates how airborne pollen pellets (or grains) can cause severe respiratory-related problems in humans. Given that pollen pellets can capture ribonucleic acid viruses, we show that airborne pollen grains could transport airborne virus particles such as the airborne coronavirus (CoV) disease (COVID-19) or others. We consider the environmental conditions featuring the highest pollen concentration season and conduct computational multiphysics, multiscale modeling and simulations. The investigation concerns a prototype problem comprising the transport of 104 airborne pollen grains dropped from a mature willow tree at a wind speed of . We show how pollen grains can increase the coronavirus (CoV) transmission rate in a group of people, including some infected persons. In the case of high pollen grains concentrations in the air or during pollination in the spring, the social distance of 2 m does not hold as a health safety measure for an outdoor crowd. Thus, the public authorities should revise the social distancing guidelines.
REFERENCES
1.
See https://askabiologist.asu.edu/images/zoom/pollen-gallery-pollen-close for “
Ask a Biologist, Arizona State University, pollen images from USDA - United States Department of Agriculture
” (last accessed April 20, 2021
).2.
E.
Katifori
,
S.
Alben
,
E.
Cerda
,
D. R.
Nelson
, and
J.
Dumais
, “
Foldable structures and the natural design of pollen grains
,” Proc. Natl. Acad. Sci.
107
, 7635
–7639
(2010
).3.
J.
Subiza
,
M.
Cabrera
,
R.
Valdivieso
,
M.
Jerez
,
J. A.
Jimenez
,
M. J.
Narganes
, and
E.
Subiza
, “
Seasonal asthma caused by airborne platanus pollen
,” Clin. Exp. Allergy
24
, 1123
(1994
).4.
N.
Madanes
and
J. R.
Dadon
, “
Assessment of the minimum sample size required to characterize site-scale airborne pollen
,” Grana
37
, 239
–245
(1998
).5.
M. J.
Velasco-Jiménez
,
P.
Alcázar
,
E.
Domínguez-Vilches
, and
C.
Galán
, “
Comparative study of airborne pollen counts located in different areas of the city of Cordoba (south-western Spain
),” Aerobiologia
29
, 113
–120
(2013
).6.
M.
Sado
and
Y.
Inouye
, “
A statistic study of airborne pollen grains
,” Yakugaku Zasshi
120
, 491
–505
(2000
).7.
A.
Damialis
,
D.
Gioulekas
,
C.
Lazopoulou
,
C.
Balafoutis
, and
D.
Vokou
, “
Transport of airborne pollen into the city of Thessaloniki: The effects of wind direction, speed and persistence
,” Int. J. Biometeorol.
49
, 139
–145
(2005
).8.
F.
Tampieri
,
P.
Mandrioli
, and
G. L.
Puppi
, “
Medium range transport of airborne pollen
,” Agric. Meteorol.
18
, 9
–20
(1977
).9.
J.
Buitink
,
C.
Walters-Vertucci
,
F. A.
Hoekstra
, and
O.
Leprince
, “
Calorimetric properties of dehydrating pollen (analysis of a desiccation-tolerant and an intolerant species
),” Plant Physiol.
111
, 235
–242
(1996
).10.
R.
Singh
,
A. L.
Levitt
,
E. G.
Rajotte
,
E. C.
Holmes
,
N.
Ostiguy
,
D.
vanEngelsdorp
,
W.
Ian Lipkin
,
C. W.
dePamphilis
,
A. L.
Toth
, and
D. L.
Cox-Foster
, “
RNA viruses in hymenopteran pollinators: Evidence of inter-taxa virus transmission via pollen and potential impact on non-Apis hymenopteran species
,” PLoS One
5
, e14357
(2010
).11.
M. J.
Hoogeveen
, “
Pollen likely seasonal factor in inhibiting flu-like epidemics. A Dutch study into the inverse relation between pollen counts, hay fever and flu-like incidence 2016–2019
,” Sci. Total Environ.
727
, 138543
(2020
).12.
J.
Van Cleemput
,
K.
Poelaert
,
K.
Laval
,
F.
Impens
,
W.
Van den Broeck
,
K.
Gevaert
, and
H.
Nauwynck
, “
Pollens destroy respiratory epithelial cell anchors and drive alphaherpesvirus infection
,” Sci. Rep.
9
, 4787
(2019
).13.
L.
Holmquist
,
J.
Weiner
, and
O.
Vesterberg
, “
Airborne birch and grass pollen allergens in street-level shops
,” Indoor Air
11
(4
), 241
–245
(2001
).14.
F.
Lo
,
C. M.
Bitz
,
D. S.
Battisti
, and
J. J.
Hess
, “
Pollen calendars and maps of allergenic pollen in North America
,” Aerobiologia
35
, 613
–633
(2019
).15.
See https://covid19.biglocalnews.org/county-maps/index.html and https://www.click2houston.com/news/local/2020/04/30/map-track-coronavirus-infection-rates-per-capita-county-by-county/ for “Local News by Fares Sabawi, Digital Journalist, Map of 30 April 2020” (last accessed April 23,
2021
).16.
J.
Kartesz
, see http://www.bonap.net/tdc for “
The Biota of North America Program (BONAP) 2021. Taxonomic Data Center, Chapel Hill, N.C. Maps Generated from J. T. Kartesz, 2021. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP)
” (last accessed April 23, 2021
).17.
18.
T.
Dbouk
and
D.
Drikakis
, “
On coughing and airborne droplet transmission to humans
,” Phys. Fluids
32
, 053310
(2020
).19.
T.
Dbouk
and
D.
Drikakis
, “
On respiratory droplets and face masks
,” Phys. Fluids
32
, 063303
(2020
).20.
T.
Dbouk
and
D.
Drikakis
, “
Weather impact on airborne coronavirus survival
,” Phys. Fluids
32
, 093312
(2020
).21.
T.
Dbouk
and
D.
Drikakis
, “
On airborne virus transmission in elevators and confined spaces
,” Phys. Fluids
33
, 011905
(2021
).22.
T.
Dbouk
and
D.
Drikakis
, “
Fluid dynamics and epidemiology: Seasonality and transmission dynamics
,” Phys. Fluids
33
, 021901
(2021
).23.
F.
Moukalled
,
L.
Mangani
, and
M.
Darwish
, The Finite Volume Method in Computational Fluid Dynamics: An Advanced Introduction with OpenFOAM and MATLAB
, 1st ed. (
Springer Publishing Company, Inc.
, 2015
).24.
25.
E.
Yoshii
,
H.
Taira
,
H.
Teranishi
,
Y.
Kenda
,
Y.
Fujisaki
, and
M.
Saito
, “
Observations of airborne cryptomeria japonica pollen in the summer
,” Allergol. Int.
50
, 171
–177
(2001
).© 2021 Author(s). Published under an exclusive license by AIP Publishing.
2021
Author(s)
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