NITEROI, BRAZIL - AUGUST 02: Pollution rests among pollution along the edge of Guanabara Bay, the venue for the Olympic sailing, on August 2, 2016 in Niteroi, Rio de Janeiro state, Brazil. The polluted bay has raised concerns for years among athletes and residents and the Rio government promised to have most of it cleaned in time for the games. (Photo by Mario Tama/Getty Images)
