A PFAS Replacement Chemical Is Priming Kids for Asthma

A chemical called F-53B, marketed as a replacement for older PFAS compounds, is rewiring children's lung immune systems and making them more likely to develop asthma.

What the Study Found

A 2026 study in Chemical-Biological Interactions found that early-life exposure to F-53B remodels the pulmonary immune microenvironment. It changes which immune cells show up in the lungs and how they behave. The result: the lungs become primed for neutrophil-predominant asthma, a severe form of asthma that's harder to treat with standard medications.

The mechanism involves dysregulation of arachidonic acid metabolism, a pathway that controls inflammation in the lungs. F-53B throws this pathway off balance during the critical window of early development.

What Is F-53B?

F-53B is a per- and polyfluoroalkyl substance (PFAS) used as a replacement for older PFAS in industrial processes, particularly chrome plating. It's been detected in drinking water, food, and human blood. Like all PFAS, it doesn't break down in the environment.

What You Can Do

Filter your drinking water with a system rated for PFAS removal (reverse osmosis or activated carbon). Avoid nonstick cookware and stain-resistant fabrics. Check if your water supply has been tested for PFAS contamination.

Browse our non-toxic baby products for PFAS-free options.

Also see glass food storage for safer alternatives.

Source: Zeng D, Hu L, Ren K, et al. (2026). Chem Biol Interact.