where is the most polluted part of a river?\nfarthest upstream\nfarthest downstream

where is the most polluted part of a river?\nfarthest upstream\nfarthest downstream
Answer
Brief Explanations:
Pollutants flow downstream with the river's current. As they move, they accumulate in the lower - lying areas. So, the part of the river that is farthest downstream would have the most pollutants.
Answer:
Farthest downstream