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 Regional Park and at Saturn Boulevard in San Diego.

Since 2018, more than 200 billion gallons of toxic sewage, trash and unmanaged stormwater have flowed across the United States-Mexico border into the Tijuana River. The impact on neighboring communities includes long-lasting beach closures and lingering effects on public health, the environment and water quality.

In September 2024, high levels of noxious gases such as hydrogen sulfide and hydrogen cyanide were measured by scientific teams in t

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