In southern Israel's agricultural fields, a quiet discovery is reshaping how scientists track invisible pollution: potatoes may be better detectives than soil itself. Researchers from the Hebrew University of Jerusalem and partner institutions found that potato leaves contained concentrations of certain PFAS compounds hundreds of times higher than the surrounding soil, revealing recent airborne contamination that traditional environmental monitoring could easily miss.
This matters because PFAS—the "forever chemicals" used in firefighting foams, water-repellent coatings, nonstick cookware, and countless industrial products—persist in the environment for decades or centuries. Once in the air, water, or soil, they don't break down. PFAS have been detected in the blood of the vast majority of people worldwide, and the question scientists now face isn't whether we're exposed, but to what extent.
The research, published in the Journal of Hazardous Materials, analyzed soils, potato leaves, and potato tubers from the conflict-affected region, offering a natural laboratory for understanding how airborne contaminants move through agricultural systems under complex real-world conditions. The distribution patterns told a revealing story. Agricultural soils were dominated by PFAS linked to long-term inputs like treated wastewater irrigation and biosolid applications—the slow accumulation of years or decades. But the potato leaves? They contained elevated concentrations of short-chain PFAS compounds known to travel efficiently through the atmosphere, suggesting direct exposure from the air rather than absorption through roots alone.
Led by Nitzan Shy, Dr. Shira Rosencwaig, Dr. Tali Ilani, Dr. Evyatar Ben Mordechay, and Prof. Benny Chefetz, the team considered what might be releasing these airborne compounds. While they did not identify specific sources directly, they noted that military-related activities in the region—including the use of aqueous film-forming foams (AFFF) and potentially explosives—could contribute to atmospheric PFAS deposition. The lack of a clear relationship between soil PFAS levels and distance from conflict zones reinforces the hypothesis that recent airborne inputs, rather than soil-based contamination, may be the dominant pathway for the elevated leaf concentrations observed.
The implications are profound. Plants appear to capture a snapshot of recent environmental exposure, while soils preserve a decades-long record of accumulated contamination. This makes vegetation an invaluable environmental sentinel—revealing the immediate, the urgent, the hidden. Importantly, the edible portions of potatoes—the tubers themselves—contained substantially lower PFAS concentrations than the leaves, suggesting that leaves and roots are the dominant accumulation sites, not the food we harvest.
This research opens a new tool for environmental monitoring that complements traditional soil-based approaches. By watching what plants absorb from the atmosphere, scientists can detect recent contamination events that would otherwise be masked within the longer-term environmental record. For agricultural communities, for regulators, and for anyone concerned about the pathways by which PFAS enter our food systems and our bodies, this finding offers a clearer window into a problem that has quietly become global.