It has recently been pushing Delhi to replace all its highly polluting diesel buses with ones that run on compressed natural gas.

Ma added: "Heavy metal projects are always highly polluting.

The European Union has indicated that it may vote to label oil sands oil as "highly polluting".

Among Chhetris, the menstruation period is considered highly polluting.

These problems were exacerbated by the highly polluting discharge from Coedely coke ovens.

Very clearly, the process remains highly polluting all the same.

After heavy rain, the first flush is often highly polluting.

The complex nature of this highly polluting sector means that a global approach is necessary.

The fact is that this equipment often contains a substantial amount of highly polluting materials.

And energy still comes largely from highly polluting brown coal.