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Trent Fry, right, and Leila El Masri collect a water sample of the Tijuana River, as part of a research team from the University of California, San Diego, Wednesday, March 11, 2026, in San Diego.
AP Photo/Gregory Bull
/
AP
For decades, billions of gallons of sewage and industrial waste have been dumped into the Tijuana River. Recent research shows this chronically contaminated watershed in Southern California is also polluting the air.
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