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Ozone - Wikipedia
Ozone ( / ˈoʊzoʊn /) (or trioxygen) is an inorganic molecule with the chemical formula O 3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O 2, breaking down in the lower atmosphere to O 2 ( dioxygen ).

What is Ozone? | US EPA - U.S. Environmental Protection Agency
Ozone (O3) is a highly reactive gas composed of three oxygen atoms. It is both a natural and a man-made product that occurs in the Earth's upper atmosphere (the stratosphere) and lower atmosphere (the troposphere). Depending on where it is in the atmosphere, ozone affects life on Earth in either good or bad ways.

Ground-level Ozone Basics | US EPA
Ozone is a gas composed of three atoms of oxygen. Ozone occurs both in the Earth's upper atmosphere and at ground level. Ozone can be good or bad, depending on where it is found. Called stratospheric ozone, good ozone occurs naturally in the upper atmosphere, where it forms a protective layer that shields us from the sun's harmful ultraviolet ...

Ozone | Definition, Properties, Structure, & Facts | Britannica
Ozone is an irritating pale blue gas that is explosive and toxic, even at low concentrations. It occurs naturally in small amounts in Earth’s stratosphere , where it absorbs solar ultraviolet radiation , which otherwise could cause severe damage to living organisms on Earth’s surface.

Ozone layer | Description, Importance, & Facts | Britannica
ozone layer, region of the upper atmosphere, between roughly 15 and 35 km (9 and 22 miles) above Earth’s surface, containing relatively high concentrations of ozone molecules (O 3). Approximately 90 percent of the atmosphere’s ozone occurs in the stratosphere , the region extending from 10–18 km (6–11 miles) to approximately 50 km ...

Ozone layer - Wikipedia
The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains a high concentration of ozone (O 3 ) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.

Ozone Layer - National Geographic Society
The ozone layer is a thin part of Earth's atmosphere that absorbs almost all of the sun's harmful ultraviolet light. "Ozone holes" are popular names for areas of damage to the ozone layer. This is inaccurate. Ozone layer damage is more like a really thin patch than a hole. Photograph by Suzailan Shoroyo, MyShot Photograph Photograph Photograph

Ozone depletion | Facts, Effects, & Solutions | Britannica
ozone depletion, gradual thinning of Earth ’s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The thinning is most pronounced in the polar regions, especially over Antarctica.