- OZONE
- Fresh air, informally
- UV-absorbing layer
- Allotropic form of oxygen
- Odorous oxygen
- There's a "hole" in it
- Thunderstorm by-product
- Sun screen
- Kind of layer
- Blue gas in the greenhouse effect
- Layer that hairspray degrades
- Absorber of UV rays
- Shrinking layer
- It's overhead
- Layer that has moments of depletion
- Layer with a hole in it
- Pale blue gas
- Stratospheric layer
- Ultraviolet filter
- Layer with a hole
- Gas whose name means "smell" in Greek
- Lightning product
- Form of oxygen
- Protection in the sky
- Gas that provides cover
- Endangered layer
- Global warming factor
- Atmosphere layer
- Holey layer?
- Space cadet's place?
- Ultraviolet blocker
- Air way up there
- Molecule formed by lightning
- *Triatomic gas
- Atmospheric layer that absorbs ultraviolet rays
- Smog ingredient
- Fragile layer
- Oxygen with an odor
- Thinning atmospheric layer
- Fragile atmosphere layer
- Oxygen with a weak chlorine odor
- With 26-Down, environmentalist's concern
- 22-mile-high layer
- Ecologist's concern
- Layer that screens ultraviolet rays
- Upper atmosphere layer
- Damaged layer
- Upper atmosphere gas
- Blue gas
- Layer of concern to ecologists
- Ultraviolet ray absorber
- Stratosphere substance
- Triatomic oxygen
- Upper atmospheric layer
- Layer discussed in "An Inconvenient Truth"
- Threatened atmosphere layer
- Dwindling gas in the stratosphere
- Gas in a layer
- Atmospheric gas
- Stratosphere gas
- Endangered atmospheric layer
- Layer of concern
- Radiation-reducing layer
- Refreshing air
- It protects everybody
- Trioxygen molecule
- Atmosphere component
- Dog days pollutant
- Stratosphere layer
- With a near-homonym of 16-Across, a holey protector
- Atmospheric layer
- Layer mentioned in "An Inconvenient Truth"
- Layer measured in Dobson Units
- Diminishing layer
- Critical layer
- Precious layer
- Important layer
- Controversial stratum
- Oxygen allotrope
- Imperiled layer
- Layer that absorbs ultraviolet rays
- Layer to be concerned about
- Electrical storm byproduct
- Protective layer
- __ hole
- Gas that both protects and pollutes
- Greenhouse gas
- Hole site
- O3
- Triatomic pollutant
- UV ray absorber
- Depleted layer
- Layer to worry about
- One of the greenhouse gases
- It's a gas
- Layer with "holes" in it
- Triatomic gas in a thinning layer ... and, symbolically, what appears in this puzzle's four longest answers
- __ layer
- Depleted atmospheric layer
- Overhead concern?
- Pungent gas
- Thinning layer
- Smog element
- Type of oxygen
- Lightning byproduct
- Layer of note
- Water purification agent
- Ultraviolet-ray blocker
- Water sterilizer
- Global-warming buzzword
- Threatened layer
- UV blocker
- Stratospheric gas
- Bleaching agent
- Environmentalists' concern
- Swimming-pool sanitizer
- Triatomic molecule
- Lightning strike by-product
- Spa sanitizer
- Gas in the stratosphere
- Gaseous oxidant
- Smog component
- Trioxygen
- Main ingredient in smog
- Atmospheric layer of oxygen
- Trioxygen alias
- Atmospheric oxidant
- Protective atmospheric layer
- Atmospheric oxygen layer
- A greenhouse gas
- ___ layer (upper atmosphere part)
- EPA concern
- Word with hole or layer
- Chlorofluorocarbons deplete it
- Triatomic form of oxygen
- Water purifier
- Corrosive substance
- Absorber of ultraviolet radiation
- Allotrope of oxygen
- Triatomic greenhouse gas
- Allotrope of element #8
- Bluish gas
- Triatomic form of element #8
- Photochemical smog component
- ___ hole
- Bluish pungent gas.
- Powerful oxidizing agent.
- Pure, refreshing air.
- Pure air: Colloq.
- Refreshing air: Colloq.
- A form of oxygen.
- Air.
- Part of the atmosphere.
- Fresh air.
- Pure air.
- Fresh air: Colloq.
- Gas used as water purifier.
- The freshest air.
- Kind of air.
- Air component.
- Fresh air: Slang.
- Pure air: Slang.
- Clear air
- Bracing air
- Aura pura
- Clear, fresh air
- Important celestial layer
- Jeopardized atmospheric layer
- Layer in the atmosphere
- _____ hole (modern worry)
- Fresh air, slangily
- Part of the stratosphere
- With 33-Down, polar phenomena
- Thunderstorm product
- Ultraviolet Index factor
- What CFC's deplete
- Composition of an endangered layer
- Subject of environmentalist study
- Contents of a sensitive layer
- Kind of hole
- Ray blocker
- Thunderstorm residue
- Earth's ___ layer
- Kind of layer protecting the earth
- Ultraviolet light filter
- A high flier may fly in it
- Gas with a penetrating odor
- Globe coverer
- ___-friendly (ecolabel)
- Form of oxygen with a sharp odor
- Radiation reducer
- O-O-O
- Protection around the world?
- Form of 10-Down
- Triatomic oxygen molecule
- Layer in global warming discussions
- Layer in the stratosphere
- Part of the atmosphere depleted by CFCs
- UV light blocker
- It covers the globe
- Worry of stratospheric proportions
- Air supply
- Another name for O3 (as appropriate to 17-, 25-, 44- and 58-Across?)
- Layer of the upper atmosphere
- It's made of three oxygen atoms
- Vital part of the stratosphere's protective layer
- Stratosphere layer with a "hole"
- Global protection
- What offers worldwide protection?
- Molecule also called trioxygen
- Site of a worrisome hole
- It's up in the air
- Ace Frehley song about a layer?
- Famed form of oxygen
- Layer in the news
- Allotropic form of element No. 8
- Noted form of oxygen
- Noted pale-blue gas
- Molecule that causes thunderstorms to have a smell
- ___ layer
- Protective atmospheric gas
- ___ layer (endangered part of the atmosphere)
- Certain layer
- Type of layer or hole
- A layer with a hole
- Kind of hole or layer
- ___ layer (part of the stratosphere)
- Important type of layer
- Layer up high
- Sensitive layer
- Ultraviolet radiation absorber
- Certain atmospheric gas
- Certain atmospheric layer
- Atmospheric layer of note
- Layer that reduces radiation
- Blocking layer
- Layer that absorbs ultraviolet radiation
- Layer that blocks ultraviolet rays
- Atmosphere protector
- Its chemical formula is O3
- Gas in an atmospheric layer
- Delicate layer
- Ultraviolet rays absorber
- Protective stratosphere
- UV ray blocker
- Heavy oxygen
- Word with layer and hole
- Atmospheric concern
- Much-discussed layer
- Eco-worry
- Atmospheric layer with a "hole" in it
- Substance in a stratospheric layer
- UV ray-blocking gas
- Gas in a protective layer
- Gas in a stratospheric layer
- Gas with a pungent odor
- Atmospheric gas of concern to Gore
- Pungent, pale-blue gas
- Makeup of a layer in the stratosphere
- Stuff in a stratospheric layer
- UV-blocking molecule
- ___ layer (stratosphere part)
- UV-blocking gas
- Hole locale
- The hole matter?
- Protective shield makeup
- UV filterer
- Low-level pollution or high-level protection
- Layer that filters out UV rays
- Essential atmospheric layer
- UV stopper
- Ultraviolet absorber
- Ultraviolet-blocking gas
- Gas emitted by some pollutants and depleted by some
- Makeup of a holey layer
- It's good up high and bad down low
- Gas that filters out UV rays
- Molecule with three oxygen atoms
