Assertion: ozone's concentration | /r/HasProperty | natural sources
Facets:
value: for all of these species
type: OTHER
Source sentences:
text: While there are natural sources for all of these species, the concentrations of chlorine and bromine increased markedly in recent decades because of the release of large quantities of man-made organohalogen compounds, especially chlorofluorocarbons (CFCs) and bromofluorocarbons.