They remove pollution from waters that flow through them and recharge underground aquifers.

The more foliage a plant has, the better it is at removing pollution.

Work was then started to remove buildings, scrap and pollution from Bloors Wharf for the new park.

Bioswales are landscape elements designed to remove silt and pollution from surface runoff water.

Repairs were carried out and the keep was cleaned, removing pollution that was causing damage to the structure.

He uses film crews to record the benefits his people are doing, like removing pollution from the water.

Another way to remove pollution from surface runoff water is bioswale.

At the conclusion of the construction project, the gravel was removed, theoretically removing oil leaks and other pollution with it.

The Senate began debate today on legislation that would provide powerful new tools for removing pollution from the nation's skies.

Some bills would have required scrubbers to remove pollution before it emerges from the smokestack.