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. 2010 Jun 1;10(6):5469–5502. doi: 10.3390/s100605469

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© 2010 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 19. — Graph comparing the responses of chemiluminescence and semiconductor sensors. Measurements were simultaneous and made every minute. X-axis indicates hours since experiment start and y-axis ppb concentration of NO₂. Figure adapted with permission from [73].