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Figure 2 | Environmental Evidence

Figure 2

From: What is the effect of phasing out long-chain per- and polyfluoroalkyl substances on the concentrations of perfluoroalkyl acids and their precursors in the environment? A systematic review protocol

Figure 2

Timeline of production, commercialization and legislation of PFSAs. POSF (perfluorooctane sulfonyl fluoride) is the major raw material used to manufacture PFOS. Red flags represent events and actions that may have resulted in increased concentrations in the environment. Green flags represent important findings and phase-outs that may result in decreased concentrations in the environment.

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