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. 2016 Jun 13;9(2):559–581. doi: 10.1007/s12561-016-9150-3

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Average concentrations of black smoke ( $μ$ gm $^{- 3}$ ) measured at monitoring sites within the UK, 1996–1992