Which is worse nonpoint source or point source and why?

An example of non point source pollution would be the emission of lead from gasoline treated with tetraethyl lead. This source came from numerous points all across the country, from each and every car.. From the start of its use to it was passed out the average blood lead levels in Americans rose from essentially zero to 13.7 μg/dl in 1976. At this level the intelligence of children was impaired This is a vey serious impact.
An example of non-point source would be the emission of sulphur dioxide gas from smelters, power plant stacks and industrial processes. This caused acid rain which damage forests and soil over much of North America and destroyed the breeding areas of fish in countless lakes. Again a very serious impact.

From these examples it can be concluded that both types of problems are capable of causing serious impact. The major advantage of defined source emissions is that they can be controlled by discrete treatment systems (air pollution treatment) on a few well identified and identifiable sources rather than sweeping changes in gasoline formulas, engine design and a slow program of attrition to remove the millions of sources.