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. 2017 Mar 23;7:335. doi: 10.1038/s41598-017-00444-w

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© The Author(s) 2017

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Time series of the observed mass concentration of PM_2.5, PM₁₀ and constructed PM₁₀ according to the POPC measurement, relative humidity (a), volume size distribution (b), hourly averaged depolarization ratio at Dp = 1 μm, 2 μm and 5 μm (c) and equivalent concentrations of identified water-soluble compounds in both the fine mode (PM_2.5) (d) and coarse mode (PM_2.5–10) (e) on the basis of filter-based chromatography analysis.