Ozone is a naturally occurring gas found in the atmosphere where it absorbs most of the sun's ultraviolet light - invisible rays which are harmful to both plant and animal life.
Ozone is found throughout the atmosphere including at ground level, but is mostly (about 90%) found in a band called the ozone layer at about 15 - 30 km above the Earth's surface, in the stratosphere, the height at which larger aircraft fly. It is not really a “layer” at all but one of many gases found in the stratosphere.
The ozone layer is essential for life - until it was formed, about a billion years ago, the only life on Earth was at the bottom of the ocean. It is thought that single celled organisms released oxygen through photosynthesis.
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