PFAS Levels in Seabird Eggs Decline Sharply After Decades of Industrial Pollution
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A study of northern gannet eggs on Bonaventure Island shows concentrations of several 'forever chemicals' have fallen significantly over the last 55 years, with some dropping by more than 70%. The decline follows a peak in the 1990s and coincides with industry scaling back production and international agreements to phase out these substances.
Facts First
- PFAS concentrations in northern gannet eggs have decreased over 55 years, after rising exponentially in the 1960s and peaking in the 1990s.
- Perfluorooctanesulfonic acid (PFOS) levels fell by 74%, and perfluorohexanesulfonic acid (PFHxS) levels were 70% lower from the baseline.
- The decline coincides with industry and regulatory action, including a chemical corporation scaling back production in the late 1990s.
- International agreements targeted these chemicals, with the Stockholm Convention calling for elimination of PFOA and PFHxS and restricting PFOS.
- The birds' exposure came via fish consumption near the St. Lawrence Seaway, historically connected to Great Lakes manufacturing centers.
What Happened
A scientific study analyzed PFAS concentrations in eggs from northern gannets on Bonaventure Island, the world's largest breeding colony for the species. The study found that the content of some commonly used PFAS in these eggs has fallen by 70% or more over the last 55 years. PFAS concentrations first rose exponentially during the 1960s and peaked in the 1990s. Specific declines include perfluorooctanesulfonic acid (PFOS) by 74%, perfluorooctanoic acid (PFOA) by 40%, and perfluorohexanesulfonic acid (PFHxS) by 70% from the baseline.
Why this Matters to You
PFAS are a class of chemicals used to make water-, stain-, and heat-resistant coatings in many consumer products. Their presence in wildlife serves as an indicator of environmental contamination that can also affect human food sources. The documented decline suggests that regulatory and industry actions to reduce PFAS production may be having a measurable, positive effect on the environment. This could signal a pathway for reducing human exposure to these persistent chemicals over time.
What's Next
The study's findings highlight the impact of past agreements, like the 2015 phase-out agreement between the chemical sector and the Environmental Protection Agency (EPA) and the 2009 Stockholm Convention, which targeted PFOA, PFHxS, and PFOS. Continued monitoring of wildlife like the northern gannets may provide further evidence on whether these declines continue as production restrictions are upheld. The results could inform future regulatory decisions on other PFAS chemicals still in use.