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

Figure 6.

Figure 6 is a line graph, plotting Average daily maximum 8-hour average ozone concentrations (micrograms per meter cubed), ranging from 90 to 110 in increments of 5 (y-axis) across Year, including 2008, 2012, and 2016 (y-axis) for China, North China Plain, the Yangtze River Delta region, and the Pearl River Delta.

Annual trend of mean O3 season average MDA8 O3 concentrations from 2005 to 2019. O3 season is defined as March–November. The lines with different colors and marks represent the model-predicted mean MDA8 O3 concentrations in different regions. Gray line with round marks denotes China; the red line with cross marks, the PRD; the orange line with triangular marks, the NCP; and the blue line with square marks, the YRD. Note: MDA8, daily maximum 8-h average; NCP, the North China Plain; O3, ozone; PRD, the Pearl River Delta; YRD, the Yangtze River Delta.