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Volume 45, Issue 2
  • ISSN: 0032-1400


The United States motor vehicle emission control programme is noted for its pioneering role and success in limiting exhaust pollution, utilising the three-way catalyst, cleaner fuels, improved engine design and calibration strategies. The progressive lowering of the emission limits by technology-forcing legislation the agencies of the U.S. Environmental Protection Agency and the California state legislature has resulted in cleaner air. Here, progress to date and future intentions for emissions from gasoline and diesel vehicles are discussed.


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  1. U.S. EPA, Latest Findings on National Air Quality: 1999 Status and Trends, August 2000
  2. U.S. EPA, National Air Pollutant Emission Trends, 900-1998, March 2000
  3. Clean Air Act Amendments of 1970. ” (PL 91-604, 1970)
  4. Clean Air Act Amendments of 1977. ” (PL 95-95, 1977)
  5. Clean Air Act Amendments of 1990. ” (PL 101-549, 1990)
  6. U.S. EPA, “ Control of Air Pollution from New Motor Vehicles: Tier 2 Motor Vehicle Emission Standards and Gasoline Sulfur Control Requirements. ”, 40 CFR Parts 80, 85, and 86, 65 FR 6698 (Feb. 10, 2000)
  7. U.S. EPA, “ Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-Duty Highway Engines and Vehicles; Revision of Light-Duty On-Board Diagnostics Requirements. ”, 40 CFR Parts 85 and 86, 65 FR 59896 (Oct. 6, 2000)
  8. U.S. EPA, “ Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards and Highway Diesel Sulfur Control Requirements. ”, 40 CFR Parts 69, 80, and 86 Dec. 21, 2000)
  9. California Air Resources Board, Risk Reduction Plan to Reduce Particulate Matter Emissions from Diesel-Fueled Engines and Vehicles, Sacramento, CA:, Oct. 2000

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  • Article Type: Research Article
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