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Table 1 Measured air pollution values in the Oslo University Aula and outdoors in the centre of Oslo in the winter 2019

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

Pollutant Concentration (µg m−3)
Indoor (I) Outdoor (O) I/O
NO2 18.1 30.7 0.59
O3 25.3 53.5 0.47
HNO3 0.03