Heavily polluted Tijuana River drives regional air quality crisis.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40875844.
- Also identified by DOI 10.1126/science.adv1343.
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Abstract
Industrial chemicals and untreated sewage have polluted the Tijuana River for decades, recently causing >1300 consecutive days of California beach closures. In summer 2024, wastewater flows surged to millions of gallons per day despite no rain, enhancing water-to-air transfer of hydrogen sulfide (H<sub>2</sub>S) and other toxic gases at a turbulent hotspot. High wastewater flows and low winds led to nighttime H<sub>2</sub>S peaks, reaching 4500 parts per billion (ppb)-exceeding typical urban levels of <1 ppb. H<sub>2</sub>S levels and community malodor reports were strongly correlated (correlation coefficient <i>r</i> = 0.92), validating long-dismissed community voices and highlighting an environmental injustice. This study demonstrates that poor water quality can substantially affect air quality-although rarely included in air quality models and health assessments-with far-reaching implications as polluted waterways increase globally.