Central Valley Fog: Misinformation Sparks Outrage

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(LibertystarTribune.com) – Social media panic over “radiation fog” reveals the dangers of misinformation, not radioactive threats.

Story Snapshot

Viral social media posts misinterpret “radiation fog” as hazardous, causing panic.
Experts confirm the fog is a natural winter phenomenon, not radioactive.
Fog traps pollutants due to Central Valley’s poor air quality.
Driving hazards increase with reduced visibility from persistent fog.

Public Misunderstanding of “Radiation Fog”

In December 2025, social media users in California’s Central Valley expressed panic over what they called “radiation fog,” mistaking the term for a radioactive threat. This reaction was fueled by viral posts that misunderstood the natural meteorological process known as radiation fog, which results from radiational cooling. Despite experts’ efforts to clarify that this fog is not radioactive, public fear persisted, underscoring the influence of misinformation.

The phenomenon, commonly experienced during California’s winter months, is a result of moist air cooling to its dew point under clear skies and calm conditions. The resulting fog is trapped in the Central Valley’s topographical “bowl,” exacerbated by recent weather patterns including heavy rainfall and coastal high pressure. This seasonal occurrence has been routine, yet social media misinterpretations have sensationalized its presence.

Pollution and Visibility Concerns

While radiation fog itself is harmless, the pollutants it traps can pose health risks. In the Central Valley, known for its poor air quality, fog droplets can capture smog particulates, making the air less healthy to breathe. Peter Weiss-Penzias, a fog researcher at UC Santa Cruz, emphasizes that the fog’s contents are mundane pollutants, not radioactive particles. This highlights a critical issue of air quality rather than any exotic threat.

Visibility reductions have also led to increased driving hazards. The dense fog has caused several traffic disruptions and accidents, underscoring the need for caution among commuters. Although the frequency of such fog events has been declining in the long term, current conditions have led to an extended period of foggy weather, affecting daily life and transportation in the region.

Experts Debunk Radiation Fears

Meteorologists and researchers have been active in debunking the myths surrounding radiation fog. The term “radiation” refers to the radiational cooling process, not ionizing radiation. This type of fog is a well-documented natural occurrence, with no evidence of radiation-related hazards. Local news outlets, such as ABC7 News and the LA Times, have reported on the panic while emphasizing expert assurances that the fog poses no unusual danger.

What is the mysterious ‘radiation’ fog blanketing California – and is it dangerous? ⁦@CAgovernor⁩ is letting the planes leave the geo engineering tracks in the sky. I see it. He knows what he’s doing https://t.co/UAil8znDG4

— MADDMAXX65000 (@MADDMAXX6565) December 22, 2025

The broader implications of this event include renewed scrutiny on air pollution controls in the Central Valley, a region known for its environmental challenges. As the fog persists, residents are reminded of the importance of understanding natural weather phenomena and the dangers of misinformation in amplifying unnecessary fears. The focus remains on improving air quality and ensuring public safety amid routine weather patterns.