This question needs a definition of the word "polluted" which can mean many things - from total dissolved solids to most harmful to life to most opaque to most hydrocarbons - you get the idea.
The Kara Sea in the Russian high Arctic would be a good candidate due to the radioactive wastes from former soviet warships.
is around the world
most ocean pollution comes from human activities and natural occurences
Ocean pollution is garbage or chemicals that are spilled into the ocean. Plastics and fertilizers are the most common forms of ocean pollution.
Industrial effluents.
The most common type of ocean pollution is garbage or sewage. They are readily dumped into the ocean by ships and countries located along the ocean.
China
Runoff from land.
china and the usa
a can in the ocean is pollution.
Puting garbage in the sea/ocean/river.
Ocean pollution occurs when harmful effects, or potentially harmful effects, can result from the entry into the ocean of chemicals, particles, industrial, agricultural and residential waste, noise, or the spread of invasive organisms.
Nuclear waste pollution can cause people and animals to suffer and most likely die from its poisons
I think that the ocean water turns green is by pollution