SÃO PAULO, BRAZIL - The polluted stretch of the Tietê, the longest river in the state of São Paulo, has reached 163 kilometers (km) this year, representing an increase of 33.6 percent compared to last year (122 km), and the water is unsuitable for use. The smallest river length of pollution ever recorded in the survey's historical series occurred in 2014 when the polluted stretch was 71 km.
The data were compiled by the SOS Mata Atlântica Foundation in the report "Observing Tietê 2019 - The Portrait of Water Quality and the Evolution of Impact Indicators of . . .