Nationwide Air Pollution Trends

Based on source emission factors and geographically based emission inventories, nationwide information can be developed. Figure 5.1.2 summarizes nationwide air pollution emission trends from 1970 to 1991 for six key pollutants. The figure shows significant emission reductions for total suspended particulates, VOCs, carbon monoxide, and lead. The greatest reduction from 1982-1991 was an 89% reduction in lead levels in the air resulting primarily from

1970 1975

I I Transportation

I I Solid Waste

1980 1983 1985

I I Fuel Combustion

Miscellaneous

1987 1991

I I Industrial Processes

FIG. 5.1.4 U.S. emissions of particulates by source, 1970-1991. (Reprinted from Council on Environmental Quality 1993.)

FIG. 5.1.4 U.S. emissions of particulates by source, 1970-1991. (Reprinted from Council on Environmental Quality 1993.)

1975 1980

I I Transportation

1985 1987

I I Fuel Combustion

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