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In summer 2024, wastewater flows surged to millions of gallons per day despite no rain, enhancing water-to-air transfer of hydrogen sulfide (H\n                    <jats:sub>2<\/jats:sub>\n                    S) and other toxic gases at a turbulent hotspot. High wastewater flows and low winds led to nighttime H\n                    <jats:sub>2<\/jats:sub>\n                    S peaks, reaching 4500 parts per billion (ppb)\u2014exceeding typical urban levels of &lt;1 ppb. H\n                    <jats:sub>2<\/jats:sub>\n                    S levels and community malodor reports were strongly correlated (correlation coefficient\n                    <jats:italic toggle=\"yes\">r<\/jats:italic>\n                    = 0.92), validating long-dismissed community voices and highlighting an environmental injustice. This study demonstrates that poor water quality can substantially affect air quality\u2014although rarely included in air quality models and health assessments\u2014with far-reaching implications as polluted waterways increase globally.\n                  <\/jats:p>","DOI":"10.1126\/science.adv1343","type":"journal-article","created":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T18:00:57Z","timestamp":1756404057000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":13,"title":["Heavily polluted Tijuana River drives regional air quality crisis"],"prefix":"10.1126","volume":"389","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-0024-8806","authenticated-orcid":true,"given":"Benjamin","family":"Rico","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6065-8643","authenticated-orcid":true,"given":"Kelley C.","family":"Barsanti","sequence":"additional","affiliation":[{"name":"Atmospheric Chemistry Observations and Modeling Laboratory, NSF National Center for Atmospheric Research, Boulder, CO, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3121-8323","authenticated-orcid":true,"given":"William C.","family":"Porter","sequence":"additional","affiliation":[{"name":"Department of Environmental Sciences, University of California, Riverside, Riverside, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karolina","family":"Cysneiros de Carvalho","sequence":"additional","affiliation":[{"name":"Department of Environmental Sciences, University of California, Riverside, Riverside, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8993-9879","authenticated-orcid":true,"given":"Paula","family":"Stigler-Granados","sequence":"additional","affiliation":[{"name":"School of Public Health, San Diego State University, San Diego, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3048-9890","authenticated-orcid":true,"given":"Kimberly A.","family":"Prather","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA."},{"name":"Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/es900775p"},{"key":"e_1_3_2_3_2","unstructured":"\u201cTijuana River Valley: Needs and opportunities assessment \u201d March 2020; https:\/\/www.sdparks.org\/content\/dam\/sdparks\/en\/pdf\/Resource-Management\/NOA%20Final%20Report.pdf."},{"key":"e_1_3_2_4_2","unstructured":"Project Clean Water Tijuana (2022); https:\/\/projectcleanwater.org\/watersheds\/tijuana-wma\/."},{"key":"e_1_3_2_5_2","unstructured":"American Rivers America\u2019s Most Endangered Rivers of 2025: Tijuana River (2025); https:\/\/mostendangeredrivers.org\/river\/tijuana-river\/."},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2019.03.318"},{"key":"e_1_3_2_7_2","doi-asserted-by":"crossref","unstructured":"C. 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