Researchers said the pollutants are carried in wastewater and stormwater runoff, and become airborne in spray where the Tijuana River meets the Pacific Ocean.

Pollutant concentrations were significantly higher at Imperial Beach than farther north in La Jolla.

Researchers have found that pollutants in the Tijuana River, which carries raw sewage and industrial waste from Tijuana, are also turning up in the air along the coast near the U.S.-Mexico border.

After collecting samples from air and water along the coast, scientists from UC San Diego determined that fine particles of various pollutants from wastewater are in the air in parts of San Diego County. They found that sea spray aerosols contain illicit drugs and drug byproducts that occur in human urine, as well as chemicals from tires

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