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 ambient quality. What problems does this present in adopting emission-control policies to get a cleaner environment?

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Source 1 Production Residuals Residual handling (treatment, storage, recycling...) Emissions (time, type, location) Source 2 Production Residuals Residual handling (treatment, storage, recycling...) Emissions (time, type, location) Land Air Water Physical, chemical, hydrological, meteorological processes Ambient quality Land, air, water Human and nonhuman exposures, susceptibilities, and values Human and ecosystem damages Source n Production Residuals Residual handling (treatment, storage, recycling...) Emissions (time, type, location)