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. 2018 Jan 16;18(1):255. doi: 10.3390/s18010255

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© 2018 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 (http://creativecommons.org/licenses/by/4.0/).

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Image of the sensor’s surface on the PM10 stage: (a) zoom $\times 20$ and (b) zoom $\times 50$ . The deposition (impaction) area corresponds to the nozzle geometry for this stage which is one nozzle of 2.19 mm diameter.