Intrusion of airborne pollen through open windows and doors |
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Authors: | Juha Jantunen Kimmo Saarinen |
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Institution: | 1.South Karelia Allergy and Environment Institute,Tiuruniemi,Finland |
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Abstract: | The importance of the transport of pollen by air movement into houses was evaluated using six to eight simultaneously collecting
rotorod-type samplers, creating either a sampler line from outdoors to inside the room, or a sampler grid inside a room. The
number of incoming pollen grains was highly dependent on the outdoor concentration. The highest concentrations inside (1–2 m
distance) and outside (1 m) the room were 600 and 3,250 grains/m3, respectively, in the Betula pollen season and 1,980 and 5,080 grains/m3 in the Pinus season. The pollen concentration and the indoor/outdoor (I/O) ratio decreased as the distance from the ventilation opening
increased. Inside the room at a distance of 1–2 m 28%, and at a distance of 3–5 m 12%, of the outside concentration was recorded.
In the lower part of the opening the mean proportion was 63% and in the upper part of the opening it was 40%. Efficient ventilation
with two open windows increased the I/O ratio and enabled the pollen to spread throughout the room. During the Pinus pollen season 3–35% of the outdoor concentration was simultaneously recorded at six locations inside the room with two open
windows and only 0.1–3.6% with one open window. At the same point in the room the I/O ratio varied from <1 to 35%, depending
on the sampling conditions. Only a minor effect on the I/O ratio was found between small and large ventilation windows and
the door, although it was expected that more air and pollen grains would come indoors through a larger opening. |
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Keywords: | Atmospheric transport Betula Indoor exposure Pinus sylvestris Pollen Ventilation |
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