The effect in either case is to model both stationary and nonstationary sources effectively.

They also favor stricter controls on "stationary" sources, like factories.

For stationary sources, these two expressions give the same result.

Federal performance standards were applied to new stationary sources or to existing plants undertaking modifications.

Several strategies were available to states to bring stationary sources into compliance with air quality standards.

Under the Government program, a power plant or other "stationary source" could buy the right to continue polluting by reducing pollution from vehicles.

If these were stationary sources of contrast, his velocity was phenomenal.

A stationary source, such as a third rail or overhead wire.

Cleaning up "stationary sources" of pollution, from factories and other areas, would be cheaper, he said.

If they were from a stationary source, no plane was transmitting them.