A recent study conducted by UC San Diego researchers has found that pollutants from the sewage-laden Tijuana River are making their way into the air near the U.S.-Mexico border in San Diego County. This discovery sheds light on the far-reaching impact of environmental pollution and underscores the cross-border nature of the issue. The presence of Tijuana River pollutants in the air poses potential health risks for the communities in the vicinity, necessitating collaborative efforts between the United States and Mexico to address this transboundary environmental concern.