File Name : figure s1_global map.jpg

Caption : figure s1. the geographical locations of study sites on the world map. the red, orange, and yellow colors indicate high-, moderate-, and mild-intensity fires, respectively. the box figures show the effect sizes of fire on the polycyclic aromatic hydrocarbon concentrations (i.e., lnrr of pah concentrations). numbers 1, 6, 12, 24 represent the post-fire duration of < 1 month, 1–6 months, 6–12 months, and 12–24 months, respectively.

File Name : figure s2_teq four panels.jpg

Caption : figure s2. changes in the pah toxic equivalents at different (a) sample depth, (b) fire intensity, (c) post-fire duration, and (d) vegetation type. effect sizes are given as mean weighted natural log response ratios (lnrr) and error bars display the 95% confidence intervals; an effect size of 0 indicates no change relative to the reference, while values > 0 or < 0 indicate an increase or decrease, respectively. numbers in parentheses represent the number of observations (n) for each parameter. p < 0.05 indicates significant between-group heterogeneity.