Natural gas power emits merely 20% of the carbon monoxide of coal power, 20% of the nitrogen oxides of coal power, less than 1% of the sulfur dioxide of coal power, less than 1% of the particulate matter of coal power and less than 1% of the mercury of coal power.

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Nitrogen is separated from oxygen before combustion, thereby reducing the volume of exhaust gas and making the exhaust easier to treat by preventing the formation of polluting nitrogen oxides.

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More stringent engine standards were already set to take effect three years hence, and the EPA was now requiring at least a 90% reduction in the amount of nitrogen oxides and soot emanating from diesel engines.

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Ms. PATTON: The Four Corners Power Plant and the Navajo Generating Station collectively discharge some 77, 000 tons of smog and haze-forming oxides of nitrogen each year, and that is comparable to the amount of pollution that would be discharged from some 80 million motor vehicles.

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Automakers already strip lots of other pollutants from cars, such as the nitrogen oxides that contribute to smog, and carbon monoxide, which is poisonous.

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Professor Kyrtatos believes ships' engines could be adapted to meet impending legislation which, he predicted, would require emissions of nitrogen oxides from ship exhausts to be cut by 30% by the year 2007.

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It must implement regulations that capture the environmental benefits of nuclear, such as low emissions of carbon dioxide as well as nitrogen and sulfur oxides.

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The combined effect of charging and improved vehicle technology, notably cleaner-burning diesel engines that are being used in more buses and taxis, has led to an overall reduction of 13% in nitrogen oxides and 12% in PM10 via vehicle tailpipe emissions in the charging zone.

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