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. 2021 Aug 30;21(17):5845. doi: 10.3390/s21175845

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© 2021 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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The concentrations of particulate matter PM₁, PM_2.5 and PM₁₀ recorded as a function of time by reference station EDM 107 during the background level measurement (the first hour) and the programed five levels at 40, 70, 140, 200 and 240 µg · m⁻³. The data presented in this figure are the mean values of 5 min long measurements.