Social media users in the Central Valley are freaking out about unusual fog, and what might be in it

A 400-mile blanket of fog has socked in California's Central Valley for weeks. Scientists and meteorologists say the ...
Flying

Fog: the Malignant Weather Ninja

Fog is defined as a low cloud reducing visibility, forming when three conditions are met: condensation nuclei, high water content with a low temperature/dew point spread, and light surface winds.
Snopes.com

What to know about claims of California 'radiation fog'

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 ...