Geoscience Reference
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FIGURE 1-2
Gross trends in drivers and aggregate emissions since 1980 in the United
States. Source: EPA 2012a.
TABLE 1-1
Change in
Conventional Air Pollutant
Emissions Over the
Last 3 Decades
Change, %
1980-2010
1990- 2010
2000- 2010
Carbon monoxide (CO)
-71
-60
-44
Lead (Pb)
-97
-60
-33
Nitrogen oxides (NO
x
)
-52
-48
-41
Volatile organic compounds (VOCs)
-63
-52
-35
Direct particulate matter less than 10 µm
in diameter (PM
10
)
-83
a
-67
-50
Direct particulate matter less than 2.5 µm
in diameter (PM
2.5
)
---
b
-55
-55
Sulfur dioxide (SO
2
)
-69
-65
-50
a
Direct PM
10
emissions for 1980 are based on data since 1985.
b
--- Trend data not available.
Source: EPA2012a.
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