| English | Norwegian Bokmål |
| clean air area Areas where significant reductions in ozone forming pollutants have been achieved through industrial initiatives to control and/or prevent pollution, through implementation of transportation improvement plans, national efforts to reduce automobile tailpipe emissions and lower the volatility (evaporation rate) of gasoline | område med ren luft |
| clean air car Vehicles that function without emitting pollutants in the atmosphere | miljøvennlig bil |
| clean technology Industrial process which causes little or no pollution | ren teknologi |
| cleaning up The process of bringing desert, marsh, sea coast or other waste or unproductive land into use or cultivation | opprensing |
| contract cleaner A commercial service provider, usually bound by a written agreement, responsible for the removal of dirt, litter or other unsightly materials from any property | rengjøringsbyrå |
| dry cleaning To clean fabrics etc. with a solvent other than water | tørrensing |
| street cleaning The process of removing dirt, litter or other unsightly materials from city or town streets | gaterengjøring |
