PFAS "forever chemicals" earned their nickname through their extraordinary resistance to degradation. Their defining chemical feature — extremely stable carbon-fluorine bonds — makes them resistant to heat, light, and most chemical reactions under ordinary conditions. Since their invention in the 1940s, PFAS compounds have accumulated in soil, water, and the bodies of virtually every living organism on Earth. Scientists estimate they will persist in the environment for thousands of years without active intervention.
That persistence may have a hidden weakness. A study published in Environmental Science & Technology and covered by ScienceDaily on June 16, 2026, found that intense ultraviolet light can destroy PFAS compounds — without any added chemical reagents — by generating hydrogen radicals from water molecules. The mechanism is not new, but its role as the primary driver of PFAS degradation is. And that distinction changes how researchers and engineers think about designing practical treatment systems for PFAS-contaminated water.
