Both the cyclone and the precipitator are common pollution-control devices.

The white metal is used widely in pollution-control devices, including catalytic converters for automobiles.

The pollution-control devices account for about 40 percent of global platinum consumption.

The new pollution-control devices on cars are also adding $150 to $250 apiece to the cost of building a car, auto executives say.

State-of-the-art incinerators burn garbage at 1,800 degrees Fahrenheit and are equipped with a series of pollution-control devices.

A tentative accord was reached last week that would require the company to install $600,000 worth of pollution-control devices.

Most of this mercury pollution can be eliminated if pollution-control devices are installed.

The Federal government would continue to impose some broad measures, like changing the chemical formula of gasoline or the pollution-control devices on cars, he said.

The current rule requires plant owners to install pollution-control devices if they undertake anything more than "routine maintenance" on their plants.

Determining when a plant must install pollution-control devices has been one of the thorniest and most controversial environmental decisions facing the Bush administration.