Some people were concerned that the 1990 amendments to the Clean Air Act (CAA) would generate hot

Question:

Some people were concerned that the 1990 amendments to the Clean Air Act (CAA) would generate “hot spots” of pollution—localized areas with very high concentrations of pollutants. Why might the amendments lead to such “hot spots”? Are these “hot spots” necessarily a bad thing from an overall social welfare perspective? Explain.