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Study of human exposure and dose in pre-school schools

Batsaoura Chrysafenia

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Year 2021
Type of Item Diploma Work
Bibliographic Citation Chrysafenia Batsaoura, "Study of human exposure and dose in pre-school schools", Diploma Work, School of Chemical and Environmental Engineering, Technical University of Crete, Chania, Greece, 2021
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Studying the presence of particulate matters (PM) in indoor spaces is of high value, since evaluating their effect on humans is a highly complex issue investigated by the international research community. The aim of this thesis is twofold; firstly, to investigate if the concentration of PM inside a kindergarten class is affected by the nature of the activities that take place during lessons, and secondly to determine the personal dose. The average concentration of PM10 particles inside the kindergarten overall was found equal to 34,9 ± 24,3 μg/m3. Average concentration was also determined at every school period. Specifically, for the duration of the first period (00:00-07:30) the average value was 24,3 ± 12,9 μg/m3. Over the second period (07:30-16:30) and the third period (16:30-00:00) the average values were 47,4 ± 30,7 μg/m3 and 30,8 ± 15,8μg/m3 respectively. The conclusion that can be drawn is that throughout the second period PM concentration is elevated compared to the rest of the day, which can be attributed to the fact that this period corresponds to school hours. Finally, the average concentration outside the kindergarten class was found equal to 24,7 ± 6,4 μg/m3. Herein, the personal deposited dose of particles in the human respiratory tract was determined using an exposure dose model, the Exposure Dose Model 2 (ExDoM2), across two categories of subjects; students and teachers. The first category comprises 5-year old children and the latter adult women. The conducted experiments demonstrate that in the case of inactivity, personal dose is effectively the same across the two categories. Comparing personal dose for the same level of activity, that involves both inactivity and mild activity, the results significantly diverged, averaging at 53,9μg for children and 79,9μg for adult women. Finally, the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model was used to calculate air parcel trajectories over the days when a notable elevation in PM concentration was recorded.

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