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Heritage Science
Fig. 5 | Heritage Science

Fig. 5

From: Estimation of the historical dry deposition of air pollution indoors to the monumental paintings by Edvard Munch in the University Aula, in Oslo, Norway

Fig. 5

Amounts of ions on outdoor and indoor filter surfaces in the mechanical ventilation system and the I/O ratio. Triplicate samples of the filter surfaces were analysed. The final average variation (±) was calculated by propagation [55] from the shown triplicate standard deviations of the measured outdoor and indoor amounts of the separate ions

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