Home / Environment / Tree Swallows Near U.S. Military Bases Carry Alarming Levels of Toxic 'Forever Chemicals'
Tree Swallows Near U.S. Military Bases Carry Alarming Levels of Toxic 'Forever Chemicals'
16 Oct
Summary
- Tree swallows near U.S. military bases have 40 times higher PFAS levels than other environments
- PFAS chemicals can bioaccumulate up the food chain, impacting wildlife and humans
- Experts warn of widespread PFAS contamination from military use of firefighting foam

According to a study published in 2023, tree swallows living near U.S. military bases are carrying significantly higher levels of PFAS chemicals compared to those in other environments. PFAS, also known as 'forever chemicals', are a group of synthetic compounds that have been linked to a range of health issues, including cancer.
The researchers, led by the U.S. Geological Survey, tested eggs, nestlings, and the insects consumed by tree swallows at 10 locations across the Mid-Atlantic and Upper Midwest regions. They found that the total PFAS levels in samples from the military sites were 40 times higher than in other areas.



