Tijuana River's toxic water pollutes the air: Study shows hydrogen sulfide levels exceed air quality standards

For decades, the Tijuana River has carried millions of gallons of untreated sewage and industrial waste across the U.S.-Mexico border. The river passes through San Diego's South Bay region before emptying into the ocean, recently leading to more than 1,300 consecutive days of beach closures and water quality concerns.

source https://phys.org/news/2025-08-tijuana-river-toxic-pollutes-air.html