| Mandated pollution-control technologies, such as scrubbers in smokestacks or catalytic converters in motor vehicle engines, are another. |
| Still impure, the gas was then passed through condensers and scrubbers to remove tar, and then through iron oxide purifiers to remove other impurities. |
| However, key potential improvements, such a requirement for sulphur scrubbers, have not been properly considered. |
| She hit the enter key and the algorithm checking his control of environmental air scrubbers began. |
| Within six months the plant had installed scrubbers in the plant's chimneys. |
| In place of Aryan glory I'd grown patches of wiry baneberry thistles interspersed with industrial size brillo bathtub scrubbers. |
