Add Yahoo as a preferred source to see more of our stories on Google. While California's Central Valley was experiencing a persistent form of "radiation fog" in late 2025, the fog wasn't radioactive.

A massive fog bank that has been blanketing much of California’s Central Valley with low-lying clouds since Thanksgiving time has prompted fears online of a mysterious and harmful “radiation fog,” but ...

While California's Central Valley was experiencing a persistent form of "radiation fog" in late 2025, the fog wasn't radioactive. In fact, radiation fog is the most common type of fog in most of the ...