air
amount
atmosphere
cfc
change
chemicals
climate
cloud
compound
concept
decrease
depletion
eco
ecology
environment
gas
halocarbon
hcfc
hole
illustration
layer
lowering
nature
o2
o3
oxygen
ozone
ozone depletion
ozone hole
ozone layer
photodissociation
pollution
problem
propellants
protect
protection
refrigerants
save
solvents
stratosphere
substance
tag
total amount
troposphere
ultraviolet
ultraviolet light
uv light
word
word cloud