|
Factor |
1970 |
1999 |
Change |
|
|
|
|
|
|
GROSS EMISSIONS (Million Short Tons) |
|
|
|
Carbon Monoxide |
79.60 |
43.50 |
-45.4% |
|
Nitrogen Oxides |
5.54 |
4.50 |
-18.8% |
|
Volitile Organic Compounds |
11.96 |
4.60 |
-61.5% |
|
Particulate Matter (PM-10) |
0.30 |
0.10 |
-67.8% |
|
Particulate Matter (PM-2.5) |
0.06 |
0.06 |
-3.4% |
|
Lead |
0.17 |
0.00 |
-100.0% |
|
Average |
|
|
-42.4% |
|
|
|
|
|
|
EMISSIONS PER BILLION VEHICLE MILES |
|
|
|
Vehicle Miles (Billion) |
1,043.0 |
2,470.4 |
136.9% |
|
Carbon Monoxide |
76.32 |
17.61 |
-76.9% |
|
Nitrogen Oxides |
5.31 |
1.82 |
-65.7% |
|
Volitile Organic Compounds |
11.47 |
1.86 |
-83.8% |
|
Particulate Matter (PM-10) |
0.28 |
0.04 |
-86.4% |
|
Particulate Matter (PM-2.5) |
0.06 |
0.02 |
-59.2% |
|
Lead |
0.16 |
0.00 |
-100.0% |
|
Average |
|
|
-78.7% |
|
|
|
|
|
|
EMISSIONS PER 1,000 POPULATION |
|
|
|
Population (000,000) |
209.9 |
272.7 |
29.9% |
|
Carbon Monoxide |
379.2 |
159.5 |
-57.9% |
|
Nitrogen Oxides |
26.4 |
16.5 |
-37.5% |
|
Volitile Organic Compounds |
57.0 |
16.9 |
-70.4% |
|
Particulate Matter (PM-10) |
1.4 |
0.3 |
-75.2% |
|
Particulate Matter (PM-2.5) |
0.3 |
0.2 |
-25.7% |
|
Lead |
0.8 |
0.0 |
-100.0% |
|
Average |
|
|
-61.1% |
|
|
|
|
|
|
Source: Transportation Energy Data Book (Edition 21), September 2001 |
