They said it would not increase pollution because other rules were in place to control emissions.

The plan is the most ambitious yet in the effort to control harmful emissions through the forces of the free market.

Most states, though, would probably seek to control emissions from all types of sources.

They are also used on some wood stoves to control emissions.

You need to control emissions from burning biomass materials to prevent local air pollution.

A recent administration move to control diesel emissions has drawn praise from environmentalists.

At the meeting here, representatives of developing countries, citing recent studies, said they were already doing more than expected to control emissions.

We can control emissions but we cannot control these factors.

He is critical of climate change and has opposed enacting legislation to control emissions.

The federal law, he wrote, "does not permit one state to control emissions in another state."