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. 2021 May 15;789:147739. doi: 10.1016/j.scitotenv.2021.147739

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Fig. 7 — Percentage contribution to NO_x, VOCs, CO, PM, and SO₂ emissions from industrial (IND), power plant (POW), residential (RES), and transportation (TRA) sectors in (a) north China, (b) central China, and (c) south China. Emission data are from 2017 MEIC (http://meicmodel.org) with estimated scaling factors from 2017 to 2020.