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New Signs in Tijuana River Valley Point to Hot Spots for Emissions

New signs warn about health risks from hydrogen sulfide gas and sewage pollution; over 200 billion gallons of toxic waste have crossed the border since 2018, officials said.

One of the new warning signs placed in the Tijuana River Valley warning of hydrogen sulfide gas emissions. (Photo courtesy of Mayor Todd Gloria via X) City and county leaders Wednesday unveiled warning signs at several South Bay spots where high levels of hydrogen sulfide gas from the Tijuana River Valley have been recorded. San Diego County Supervisor Paloma Aguirre and San Diego Mayor Todd Gloria revealed the new signs at Tijuana River Valley …

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FOX 5 San Diego broke the news in San Diego, United States on Tuesday, August 19, 2025.
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