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. 2016 Apr 19;16:54. doi: 10.1186/s12890-016-0218-0

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© Wu et al. 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Plots of measured values and predicted values of PM₁₀ (a), NO₂ (b), SO₂ (c), and CO (d) at air monitoring stations in 2003 by the kriging method. Regression lines and identity lines are shown in red and blue, respectively