Among the major atmospheric contaminants which is the only one that is increasing? what is the significance of this contaminant?

CFC production has been virtually eliminated by most countries since 1995, though a few specialized products still call for them. Chlorofluorocarbons, also known as CFCs, are chemical compounds made up of chlorine, fluorine and carbon. They are very dangerous when expose into the atmosphere because of their destructive reaction with O-zone particles, which gives the Earth with a protective layer against UV radiation