Does PFAS exposure weaken a child's lung immune system?

What's actually in it

F-53B is a PFAS chemical used as a replacement for PFOS in chrome plating, metal processing, and some coatings. Like other PFAS, it builds up in the body over time. It's been detected in human blood and breast milk.

The lungs are especially vulnerable to immune disruption in early life, when the immune system is still learning what to attack and what to ignore.

What the research says

A 2026 study in Journal of Hazardous Materials found that early-life exposure to F-53B remodeled the pulmonary immune microenvironment. The lungs of exposed animals had altered immune cell populations, shifted toward inflammatory patterns that make the lungs less able to defend against infection and more prone to chronic inflammation.

The immune changes weren't minor. The composition of key immune cells in lung tissue was measurably different. These cells are responsible for fighting respiratory infections and preventing conditions like asthma.

Other PFAS have shown similar immune suppression effects in children. Research consistently shows that kids with higher PFAS blood levels have weaker antibody responses to vaccines, more respiratory infections, and higher rates of asthma. The lung immune microenvironment appears to be one of the key mechanisms.