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. 2024 Sep 24;21(10):1263. doi: 10.3390/ijerph21101263

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© 2024 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Simultaneous time series of indoor/outdoor (I/O) pollutants (PNC, PM₁₀, PM_2.5, PM₁, and eBC) measured at classrooms A and B during two non-occupancy periods (weekends and vacation), from (A) 6 to 11 December 2017 (left panel) and (B) 16 to 18 December 2017 (right panel), with stable and ventilated atmospheric conditions, respectively. In the graph, the prefix “Out” refers to outdoor, whereas “In” indicates indoor measurements.