However, in this study, the correlation between surface ozone concentrations and heatwave days and events showed a negative trend in central and eastern China (southern North China and Central China regions).
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Spatial correlations between summer ozone heatwave dual events and residents mental health in China.
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The sentences
The relationship between surface ozone concentrations and their correlation with MHQs exhibited a positive trend in low latitudes (18–30°N) of China.
The resulting slope indicates the trend of change: a positive slope suggests an increasing trend in summer surface ozone concentrations and heatwave metrics, whereas a negative slope indicates a decreasing trend.