1.44 Lead is a major pollutant in both air and water, but it is not part of the AQI. Table below shows lead emission estimates and source categories for the years 1990, 1995, and 2000 (U.S.

Environmental Protection Agency, Office of Air Quality Planning and Standards).

a Sketch a Pareto chart of source categories for the years 1990, 1995, and 2000. How do these compare?
b Has the quality of our environment improved in recent years with regard to lead?

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Source Category 1990 1995 2000 Fuel combustion 0.5 0.5 0.5 Industrial processes 3.3 2.9 3.2 Transportation 1.2 0.6 0.6 Total 5.0 3.9 4.2