article_snippet.sent: Rio's water quality has become one of the most contentious issues heading into the 2016 Olympics.
article_snippet.sent: Passers-by have to hold Passers-by noses because of the overwhelming stench coming from the surface of the water, where rowers are training .
article_snippet.sent: Sailors have repeatedly voiced concerns about possible health and safety threats posed by competing in Rio's waters.
article_snippet.sent: Mr Fonseca warned that if another fish die-off occurs during the games in August 2016, 'Rio's image could suffer irreparable damage'.
article_snippet.sent: An oceanographer said that if another fish die-off occurs during the games in August 2016, 'Rio's image could suffer irreparable damage'.