Pollutant: Volatile organic compounds, including toluene
Population Affected: 20,000+
Pollutants in the Matanza River vary greatly. A study published in the Latin American Journal of Sedimentology and Basin Analysis in 2008 revealed that soil on the banks of the river contained levels of zinc, lead, copper, nickel, and total chromium that were all above recommended levels. Chromium, for example, had a mean value in soil of 1,141 ppm, which is significantly higher than the recommended level of 220 ppm.
 1 Ronco, Alicia et al. "Screening of Sediment Pollution in Tributaries from the Southwestern Coast of the Río De La Plata Estuary." Latin American Journal of Sedimentology and Basin Analysis (2008).
 Pietri, DD, P. Dietrich, P. Mayo, and A. Carcagno. "[Multicriteria Evaluation of Environmental Risk Exposure Using a Geographic Information System in Argentina]." Revista Panamericana De Salud Publica 30.4 (2011): 377-78.
 Quality of Water for Human Consumption: The Health of the Population Residing in the Matanza-Riachuelo River Basin Area in Greater Buenos Aires]." Salud Colectiva 9.1 (2013): 53-63.
 IRC International Water and Sanitation Centre, 2009. Available at: http://www.source.irc.nl/page/46738
World Bank, 2013. Available at: http://www.worldbank.org/projects/P105680/matanza-riachuelo-basin-mrb-sustainable-development-adaptable-lending-program?lang=en&tab=overview