Two examples of point source pollution would be:
Factory smoke
Waste being directly dumped into rivers and/or oceans
Overflow of raw sewage
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An examples of point source pollution is a Industry plant releasing chemicals into the air/water or and overflow of water from a sewage pipe that the waste discharges into the water.
A way to remember what point source pollution is that you can point to where the pollution came from and laws can be enforced to prevent the pollution occurrence from happening again. A non-point source pollution is one that has many locations and you can't point to all of them.
Two examples of point source pollution would be:
Factory smoke
Waste being directly dumped into rivers and/or oceans
Overflow of raw sewage