Assertion: chlorofluorocarbon | /r/ObjectUse | used as propellant
Facets:
value: in pmdis
type: LOCATION
value: once often
type: TEMPORAL
value: in aerosol sprays
type: LOCATION
Source sentences:
text: Frank Sherwood Rowland and Mario J. Molina proposed that chlorofluorocarbons, used as propellants in aerosol sprays, contributed to the depletion of Earth's ozone layer.
text: Chlorofluorocarbons (CFCs) were once often used as propellants, but since the Montreal Protocol came into force in 1989, they have been replaced in nearly every country due to the negative effects CFCs have on Earth's ozone layer.
text: Chlorofluorocarbons (CFCs) were used as propellants in pMDIs, but these have now been replaced with HFAs, which are less destructive to the ozone layer.