Chlorofluorocarbons phasing out.
D000335:Aerosol Propellants; D000336:Aerosols; D005617:Chlorofluorocarbons, Methane; D006801:Humans; D007880:Legislation, Drug; D014481:United States
D000335:Aerosol Propellants; D000336:Aerosols; D005617:Chlorofluorocarbons, Methane