But no one denies that the river is significantly cleaner than it was 40 years ago.

Federal officials say the 1.4 million-member union is significantly cleaner after a decade of supervision.

The newer manufacturing processes required significantly cleaner "clean rooms" and many batches of integrated circuits were discarded due to manufacturing errors.

Experts agree that both produce significantly cleaner exhaust gases than either gasoline or diesel fuel.

Diesels are more fuel-efficient but dirtier than gasoline engines, although steps have been taken to make diesels significantly cleaner than they once were.

Under the best of circumstances, Mr. Waxman said, the nation will not begin to breathe significantly cleaner air until after the turn of the century.

The law calls for all Americans to be breathing significantly cleaner air by 2010.

Today, the water is significantly cleaner than when it was a dump for chemicals and sewage, but its communities retain the look of business.

Join me in this important innovation to make our air significantly cleaner, and our country much less dependent on foreign sources of energy.

The beaches are significantly cleaner.