as depicted in figure 2 3 most emissions from individual sources get mixed in with those of other sources to produce the general level of amblent quality what problems does this present in adopting emission control policies to get a cleaner environment

As depicted in Figure 2 3, most emissions from individual sources get mixed in with those of other sources, to produce the general level of amblent quality. What problems does this present in adopting emission-control policies to get a cleaner environment?

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