1.   Environment Secretary, Michael Howard, laid out a broad range of economic options, including tradeable pollution emissions, carbon taxes, road pricing and higher fuel prices.

2.   Southwest Gas Corp. computed the annual pollution emissions of a clean-burning diesel bus and a natural-gas bus, each equipped with a catalytic converter.

3.   State board officials were quick to discount the theory supported by General Motors and the theory that there are more actual pollution emissions on the weekend.

4.   The companies and the state determined what the pollution emissions of the fuel should be and how it should be blended.

5.   The effect is to shift pollution emissions so dirty air is over land longer before being blown out to sea.

6.   The U.S. plan also would permit companies to buy and sell international pollution emissions certificates.

7.   They say that their engines are designed to minimize pollution emissions not just during the tests, but also during stop-and-go urban driving.

8.   They also said a voluntary state program is reducing pollution emissions.

9.   The Executive Council has approved additional studies of the project to address environmental concerns over pollution emissions.

10.   The warning Friday marked the third time in a week that the refinery has had problems with pollution emissions.