# Operation LAC: When the U.S. Secretly Sprayed Chemicals Over Cities

Page: https://stenobird.com/podcast/the-strange-history-podcast-6015497/operation-lac-when-the-u-s-secretly-sprayed-chemicals-over-cities
Text version: https://stenobird.com/podcast/the-strange-history-podcast-6015497/operation-lac-when-the-u-s-secretly-sprayed-chemicals-over-cities.md
Podcast: [The Strange History Podcast](https://stenobird.com/podcast/the-strange-history-podcast-6015497)
Published: 2026-06-18T04:05:01+00:00
Episode link: https://www.spreaker.com/episode/operation-lac-when-the-u-s-secretly-sprayed-chemicals-over-cities--71262154
Audio file: https://dts.podtrac.com/redirect.mp3/op3.dev/e/api.spreaker.com/download/episode/71262154/elevenlabs_untitled_project_87.mp3
Processing state: not_requested
JSON: https://stenobird.com/v1/public/podcasts/the-strange-history-podcast-6015497/episodes/operation-lac-when-the-u-s-secretly-sprayed-chemicals-over-cities
Duration seconds: 460

## Resource

Did the U.S. government really spray chemicals over its own citizens? In this chilling episode of The Strange History Podcast, we uncover the truth behind Operation LAC (Large Area Coverage), a Cold War-era experiment where the U.S. Army released microscopic particles into the atmosphere over populated areas to study how biological weapons might spread. Conducted in the late 1950s, Operation LAC used zinc cadmium sulfide to track dispersal patterns across cities and rural regions—all without public knowledge or consent. While officials claimed the substance was harmless, later research raised questions about potential health risks and long-term exposure. Why did the government carry out these tests? What did they learn? And what does this reveal about the lengths taken during the Cold War in the name of national security? If you’re fascinated by government experiments, Cold War secrets, conspiracy theories, and declassified history, this episode dives into one of the most unsettling real-life operations ever conducted on American soil Become a supporter of this podcast: https://www.spreaker.com/podcast/the-strange-history-podcast--5773362/support . 🎧 The Strange History Podcast Love bizarre true stories, forgotten scandals, and history’s most unhinged moments? Submit your ideas for The Strange History Podcast Follow The Strange History Podcast wherever you listen and never miss an episode. 🔗 Listen & Subscribe: Apple Podcasts Spotify iHeartRadio Audible New episodes regularly. History gets weird here.

## Actions

- request_transcript: `POST https://stenobird.com/v1/public/podcasts/the-strange-history-podcast-6015497/episodes/operation-lac-when-the-u-s-secretly-sprayed-chemicals-over-cities/transcription-requests` — Idempotently request low-priority transcript generation for this episode.
- read_markdown: `GET https://stenobird.com/podcast/the-strange-history-podcast-6015497/operation-lac-when-the-u-s-secretly-sprayed-chemicals-over-cities.md` — Read the agent-friendly Markdown representation of this episode resource.

A page view does not enqueue transcription. Agents should invoke `request_transcript` explicitly when they need this episode processed.

## Transcript

Full transcripts are not published on public pages unless there is a clear rights basis.