City and county leaders Wednesday unveiled warning signs at several "hot spots" in the South Bay where high levels of hydrogen sulfide gas from the Tijuana River pollution crisis have been recorded.

San Diego County Supervisor Paloma Aguirre and San Diego Mayor Todd Gloria revealed the new signs in the 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 Valley and neighboring communities, forcing long-lasting beach closures and causing harmful impacts on public health, the environment and water quality.

In September 2024, high levels of noxious gases such as hydrogen sulfide and hydrogen cyanide were mea

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