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National Emission Trends
Carbon Monoxide Emissions (million tons)
| Year | Motor Vehicles | Other Sources | Total |
|---|---|---|---|
| 1970 | 88.03 | 41.41 | 129.44 |
| 1980 | 78.05 | 39.38 | 117.43 |
| 1990 | 58.44 | 40.68 | 99.12 |
| 1998 | 52.36 | 44.51 | 96.87 |
| 1999 | 49.99 | 47.45 | 97.44 |
Volatile Organic Compound Emissions (million tons)
| Year | Motor Vehicles | Other Sources | Total |
|---|---|---|---|
| 1970 | 12.97 | 18.01 | 30.98 |
| 1980 | 8.98 | 17.36 | 26.34 |
| 1990 | 6.44 | 14.61 | 21.05 |
| 1998 | 5.44 | 13.17 | 18.61 |
| 1999 | 5.30 | 12.85 | 18.15 |
Nitrogen Oxide Emissions (million tons)
| Year | Motor Vehicles | Other Sources | Total |
|---|---|---|---|
| 1970 | 7.39 | 13.54 | 20.93 |
| 1980 | 8.62 | 15.76 | 24.38 |
| 1990 | 7.21 | 16.96 | 24.17 |
| 1998 | 8.82 | 17.2 | 26.02 |
| 1999 | 8.59 | 16.8 | 25.39 |
Source: Environmental Protection Agency's "National Emmission Inventory, Air Pollutant Emmission Trends" Office of Air Quality Planning and Standards, Federal Highway Administration http://www.epa.gov/ttn/chief/trends/index.html
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