Source: SFGate
“Public health officials in San Francisco said no ‘immediate action’ is needed to protect public safety after airborne plutonium was detected in the city. In 2024, the radioactive substance Pu-239 was detected in the former Hunters Point Naval Shipyard, which was used as a repair shipyard for the U.S. Navy for nearly 30 years. The plutonium was detected in an air filter in November 2024, but the San Francisco Health Department said in a letter to Navy officials that it was not alerted until last month. … Pu-239 has a half-life of over 24,000 years and can stay in the body for decades even if ingested or inhaled in small amounts, potentially increasing the risk of developing cancer.” (11/03/25)
https://www.sfgate.com/bayarea/article/plutonium-sf-update-21135219.php