Worldwide regulatory guidance values for surface soil exposure to noncarcinogenic polycyclic aromatic hydrocarbons

► More than 39 nations have guidance values for PAH soil contamination. ► The values for noncarcinogenic PAH are highly variable. ► Values span 5.8 to 8.3 orders of magnitude and are lognormally distributed. ► The USEPA values tend to be on the high side of these distributions. ► All values are impacted by high information uncertainty.