Fluorocarbons and the ozone shield.
D000336:Aerosols; D001272:Atmosphere; D002617:Chemical Industry; D005465:Fluorocarbon Polymers / Q000009:adverse effects*; D005466:Fluorocarbons / Q000009:adverse effects*; D006801:Humans; D010126:Ozone; D011830:Radiation Effects; D014466:Ultraviolet Rays / Q000009:adverse effects; D014481:United States
D000336:Aerosols; D005465:Fluorocarbon Polymers; D005466:Fluorocarbons; D010126:Ozone