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. 2022 Feb 9;130(2):027004. doi: 10.1289/EHP9406

Figure 8.

Figures 8A, 8B, 8C, and 8D are four line graphs, plotting Population weighted concentrations (micrograms per meter cubed), ranging from 50 to 150 in increments of 50 (left y-axis) for (A) China as a whole, (B) the North China Plain, (C) the Yangtze River Delta region, and (D) the Pearl River Delta (right y-axis) across Year, including 2006, 2008, 2010, 2012, 2014, 2016, and 2018 (x-axis) for ozone and fine particulate matter.

Time-series comparison for population-weighted ambient O3 and PM2.5 concentrations in China over 2005–2018. (A) China as a whole; (B) the NCP; (C) the YRD; and (D) the PRD. r denotes the partial correlation coefficient controlling for temperature, relative humidity, and total precipitation from MERRA-2. p-Values were for the r statistics. Blue lines represent the population-weighted monthly mean MDA8 O3 predicted by our model, and the orange lines represent the population-weighted monthly mean PM2.5 concentrations from Xiao et al. (2021). Note: MDA8, daily maximum 8-h average; MERRA-2, Modern-Era Retrospective Analysis for Research and Applications; NCP, the North China Plain; O3, ozone; PRD, the Pearl River Delta; YRD, the Yangtze River Delta.