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[SITUATION] · [QUIET] · [HEALTH]
2 clusters · 2 sources · 7 days · First seen · Last updated
Drug and chemical contamination in São Paulo
Overview
Researchers at the University of São Paulo Medical School identified fentanyl in the saliva of 32% of participants using synthetic cannabinoids, such as K2 or K9. Although 69% of the study volunteers tested positive for at least one substance, none reported the intentional use of fentanyl or other opioids, suggesting potential contamination of the local drug supply.
Subsequent findings from the 2025 Tietê Expedition, conducted by SOS Mata Atlântica and four public universities, reported that no section of the Tietê River is free from contamination. The research identified cocaine, microplastics, and 25 types of pesticides in the water, including atrazine, a herbicide banned in the European Union, which was detected above legal limits in several stretches. These pollutants affect the river’s six major reservoirs, which provide water and energy to millions of people.
Entities
Tietê River · University of São Paulo Medical School · SOS Mata Atlântica · Drug and Alcohol · São Paulo
Timeline
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[HEALTH] 2 sourcesTietê River contamination reveals high levels of drugs and pesticides
The Tietê River shows widespread contamination from cocaine, microplastics, and pesticides, while USP researchers found fentanyl in users of synthetic cannabinoids.
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[HEALTH] 2 sourcesFentanyl detected in 32% of synthetic cannabinoid users in São Paulo
A University of São Paulo study found fentanyl in 32% of synthetic cannabinoid users in São Paulo, despite no reported intentional opioid use, suggesting possible drug supply contamination.
Sources
oeco.org.br · sao-paulo.estadao.com.br