1.7 Lead is a major pollutant in both air and water, but is not part of the AQI. Table below gives the lead emission estimates (in short tons), and source categories for years 1980, 1990, and 2000 (National Air Quality and Emissions Trends Report, http://www.epa.gov/airtrends).

a Sketch a Pareto chart of source categories for years 1980, 1990, and 2000.
b Compare the Pareto charts in part (a).
c Has the quality of our environment improved in recent years? Justify your answer.

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Lead Pollution Source Fuel combustion Electrical utilities Industrial Other Industrial processes 1980 1990 2000 0.129 0.064 0.072 0.060 0.018 0.017 4.111 0.418 0.412 Chemical and allied product MFG 0.104 0.136 0.218 Metal processing Other industrial processes 3.026 2.170 2.078 0.808 0.169 0.053 Waste disposal and recycling 1.210 0.804 0.813 Transportation On-road vehicles 60.501 0.421 0.020 Non-road engines and vehicles 4.205 0.776 0.545 Total 74.153 4.975 4.228