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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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Panels (A–D). Results of the PM₁₀ calibration of two UMS stations (Unit 55, Unit 18) in concentration range from 40 to 240 µg·m⁻³. Panels A and C present PM₁₀ values recorded as a function of time by EDM 107 are marked in red and those recorded by UMS stations—in black. Panels B and D present the relation of PM₁₀ concentrations obtained from UMS (Unit 55 and Unit 18, respectively) and reference station EDM107. The linear fit was drawn as red line. The data presented in this figures are the mean values of 5 min long measurements.