"A highly toxic pesticide that was banned in California more than two decades ago is still widely used across the state, potentially endangering communities near farm fields and bustling shipyards, according to a new study.
For much of the 20th century, methyl bromide, an odorless and colorless fumigant, had been touted as a miracle product for its effectiveness in killing pests, both on farms and in the shipping containers that conveyed produce across the world. But research later determined that the neurotoxic gas also can cause serious health issues in humans and contributed to the depletion of the ozone, ultimately leading to its ban under the Montreal Protocol, an international treaty, in 2005.
However, researchers from UCLA and UC Irvine recently found that methyl bromide remains in use in 36 of 58 California counties, according to data collected by the California Department of Pesticide Regulation over the last decade. From 2016 to 2023, more than 12 million pounds of the pesticide were applied in these counties, according to those data. And more than 200 fumigation facilities had active permits to emit methyl bromide statewide during that eight-year span."
Tony Briscoe reports for the Los Angeles Times January 22, 2026.
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