Spatial-Temporal Distribution Variation of Ground-Level Ozone in China's Pearl River Delta Metropolitan Region.

Seasonal Change of Ozone in Different Regions This study is based on the ozone concentration monitoring site in 2015 to study the characteristics of the spatial–temporal changes of ozone in the PRD and found that ozone pollution in the PRD has significant seasonal changes and showed a trend of high concentrations in summer and autumn and lower concentrations in winter and spring.

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The annual average ozone concentrations showed significant spatial heterogeneity and an overall trend of high concentrations in the north and east and low concentrations in the south and west ( Figure 2 ).

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