Fig. 4: Long-term trend of daytime PAN and the SHAP values of major factors.
From: Trends of peroxyacetyl nitrate and its impact on ozone over 2018–2022 in urban atmosphere
Inter-annual trend of PAN (a) and major factor SHAP values (b–f) in UV > 0 condition. Note that the red lines indicate the trend tested by Theil–Sen method, the red dash lines show the 95% confidence intervals, and the black text is the percentage rate of change with lower value and upper value (percentage/year). The * and *** show the trend significance level p < 0.05 and p < 0.001, respectively.
