[Air cleaner is needed in the car--not only for engine].
D000397:Air Pollution / Q000517:prevention & control*; D001336:Automobiles; D004391:Dust; D004782:Environmental Health; D004787:Environmental Pollution; D005374:Filtration; D001335:Vehicle Emissions
D004391:Dust; D001335:Vehicle Emissions
Luftrenare i bil behövs--inte bara för motorn.