page_title: 2016 Summer Olympics
section_title: Environmental problems
hierarchical_section_title: 2016 Summer Olympics / Concerns and controversies / Environmental problems
caption_attribution_description: Português: Trecho mostra a divisa entre Ipanema e Copacabana. A região do início da praia de Copacabana será palco da maratona aquática e da natação do triatlo. Na Praia de Copacabana, ao fundo, serão disputadas as provas de maratonas aquáticas e triatlo, além do vôlei
context_page_description: The 2016 Summer Olympics, officially known as the Games of the XXXI Olympiad and commonly known as Rio 2016, was an international multi-sport event that was held from 5 to 21 August 2016 in Rio de Janeiro, Brazil, with preliminary events in some sports beginning on 3 August. Rio was announced as the host city at the 121st IOC Session in Copenhagen, Denmark, on 2 October 2009.
  More than 11,000 athletes from 205 National Olympic Committees took part, including first-time entrants Kosovo, South Sudan, and the Refugee Olympic Team. With 306 sets of medals, the games featured 28 Olympic sports, including rugby sevens and golf, which were added to the Olympic program in 2009. These sporting events took place at 33 venues in the host city and at five separate venues in the Brazilian cities of São Paulo, Belo Horizonte, Salvador, Brasília, and Manaus.
  These were the first Olympic Games ever to be held in South America. They were also the first to be held in a Portuguese-speaking country, the first summer edition to be held entirely in the host country's winter season, the first since 1968 to be held in Latin America, and the first since 2000 to be held in the Southern Hemisphere.
context_section_description: The Guanabara Bay, whose waters were used for sailing and windsurfing competitions, is heavily polluted. Among the chief causes of the pollution are uncollected trash fed into the bay via polluted rivers and slums along the coast. Pollution of the Guanabara has been a long-term issue. Officials promised at the Earth Summit in 1992 that they would begin to address the pollution but previous attempts to do so have been insufficient. As an aspect of their bid for the Games, Rio once again committed to making efforts towards cleaning the bay. However, some of these proposed initiatives have faced budgetary issues. Prior to these efforts, only 17% of Rio's sewage was treated; this raw sewage also leaked into the bay. Although Mayor of Rio Eduardo Paes stated that the city may not be able to reach its goal of having 80% of sewage treated, at least 60% of sewage was treated by March 2016, with a projected goal of 65% of sewage being treated by the time the Olympics started.
caption: Fort Copacabana hosted the cycling road race (start and finish), marathon swimming and triathlon events.
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