Answer:
EXAMPLES OF POINT SOURCE POLLUTION
Industrial plants/factories (e.g., oil refineries, pulp and paper mills, chemical manufacturers, automobile manufacturers, food processors, pharmaceutical manufacturers)
Pollutants: oil, thermal pollution, toxic chemicals, heavy metals, pharmaceuticals
Sewage Treatment Plants
Pollutants: nutrients, Bacteria

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You can have error both human error i.e eye balling a measurement to what looks close. and then you have inherent error the error that is already in the equipment i.e a 2 scales one can give a measurement of x when set to zero and if put it on a second scale you could get a measurement of y when set to zero because of calibration gravity etc things you cant control
