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. 2021 Jan 13;7(3):eabd6696. doi: 10.1126/sciadv.abd6696

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Fig. 3 — Rows represent (A) NO₂, (B) O₃, (C) PM_2.5, and (D) O_x. Lower and upper box boundaries represent the 25th and 75th percentiles, respectively; line and triangle inside boxes represent median and mean values, respectively; lower and upper error lines represent 1.5 * IQR (interquartile range) below the third quartile and above the first quartile, respectively. Number of samples for P_dew in 2020 and 2016–2019 is usually 28 and 112, respectively.