Similarly, the ERA5 simulated surface ozone dataset (R 2 = 0.01, RMSE = 54.19 ppb and MAE = 49.97 ppb) showed significant deviations from the observed values and displayed a decreasing trend from north to south (Supplementary Figure S12b ).
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Parsimonious estimation of hourly surface ozone concentration across China during 2015-2020.
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