That article's only citation is a review paper, and it doesn't answer my question or substantiate your claim. It only covers how much PFAS is found in rainwater, and not how it got there.

The sources cited includes https://doi.org/10.1016/j.watres.2020.116685, which is paywalled, but the snippet of the conclusion that is shown indicates that a possible major cause is industrial emissions:

> As local sources were determined to be significant, the results imply that local action can have an impact on PFAS contamination in precipitation. A three-way ANOVA model determined that functional group, chain length, and location were significant predictors of PFAS concentrations

If you can get the full text I'd be very interested in reading about it.