Columbia subject headings:
Aerosols--Environmental aspects.
Air--Pollution.
Atmospheric ozone.
Chlorofluorocarbons--Environmental aspects.
Stratosphere.
Harvard subject headings:
Aerosols--Environmental aspects.
Air--Pollution
Atmospheric ozone.
Chlorofluorocarbons--Environmental aspects
Organohalogen compounds--Environmental aspects.
Ozone layer depletion.
Stratosphere
Princeton subject headings:
Atmospheric ozone.
Fluorocarbons--Environmental aspects.
Stratosphere.