[Measures for the maintenance of pure air].
D000397:Air Pollution / Q000517:prevention & control*; D002248:Carbon Monoxide / Q000009:adverse effects; D002958:City Planning; D005860:Germany, West; D006838:Hydrocarbons / Q000009:adverse effects; D007220:Industrial Waste; D009589:Nitrogen Oxides / Q000009:adverse effects; D011786:Quality Control; D012905:Smog; D012906:Smoke; D013454:Sulfoxides / Q000009:adverse effects; D013557:Switzerland; D014481:United States; D001335:Vehicle Emissions
D006838:Hydrocarbons; D007220:Industrial Waste; D009589:Nitrogen Oxides; D012905:Smog; D012906:Smoke; D013454:Sulfoxides; D001335:Vehicle Emissions; D002248:Carbon Monoxide
Massnahmen zur Reinhaltung der Luft.