#PollensAreAirborne
Average pollen size 25 microns, i.e., about 125 times larger than respiratory aerosols carrying pathogens.
Average pollen size 25 microns, i.e., about 125 times larger than respiratory aerosols carrying pathogens.
He investigated over 80 types of pollens, concluding grasses caused the greatest reaction. He was in correspondence with Darwin:
Darwin asked if there is a difference between plants that pollinate by wind and those that pollinate by insects.
Darwin asked if there is a difference between plants that pollinate by wind and those that pollinate by insects.
Can pollen be carried large distances in the upper regions of the atmosphere? Blackley wrote on 7 July 1873: "his experiments ... inspired by Darwin’s ... collecting atmospheric dust at Porto Praya"
darwinproject.ac.uk/humannature/20…
darwinproject.ac.uk/humannature/20…
Darwin: "coniferous pollen deposited on ships, hundreds of miles out in the sea, causing hay fever among sailors who were allergic", even though they are far away from any plants.
Blackley flew kites at different altitudes with sticky slides to sample for pollen. "... in pollen seasons much higher levels were found at 1000-2000 ft than at ground level."
Thus, you have incidences out in the sea or in cities, far away from pollen sources.
Thus, you have incidences out in the sea or in cities, far away from pollen sources.
#PollensAreAirborne
Average pollen size 25 microns, i.e., about 125 times larger than respiratory aerosols carrying pathogens.
Average pollen size 25 microns, i.e., about 125 times larger than respiratory aerosols carrying pathogens.
en.wikipedia.org/wiki/Charles_H… Charles Blackley - one of the first persons to understand allergic rhinitis (hay fever) is caused by pollen through extensive self-experimentations - he was afflicted by the allergies as well.
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