As shown in Figure , the number of fluorinated compounds (>21 million) and PFAS (7.4 million with salts and mixtures, 6.5 million without) in PubChem is much higher than the common PFAS screening lists of four to ten thousand entries. Of the 20 million organofluorine compounds classified according to the OECD 3 (see Figure ), ~900,000 are fluorinated aliphatic substances and 19.4 million are fluorinated aromatic substances; just under 100,000 fall into the "other" category which contain fluorine connected to non-carbon organic elements (a more detailed breakdown can be obtained by expanding the respective node in the PubChem PFAS Tree). Note that compounds can fall into more than one of these categories; the node totals always indicate the total number of CIDs under the entire node. For instance, there is no overlap between the fluorinated aliphatic and fluorinated aromatic substances, while 17,044 of the "other fluorinated substances" are also "fluorinated aromatic substances" and 7,633 are also "fluorinated aliphatic substances" (queries performed via PubChem "saved search" functionality on 17 June 2023). Approximated 120,000 fluorinated compounds fall outside the OECD organofluorine classification , contained within the "Other diverse fluorinated compounds" node.