ozone layer


Definition of ozone layer

: an atmospheric layer at heights of about 20 to 30 miles (32 to 48 kilometers) that is normally characterized by high ozone content which blocks most solar ultraviolet radiation from entry into the lower atmosphere

Examples of ozone layer in a Sentence

Recent Examples on the Web

This agreement, the Montreal Protocol, has been ratified by every United Nations country and has led, in recent years, to the ozone layer actually making a significant comeback. Avery Thompson, Popular Mechanics, "Investigation Finds China Behind Ozone-Damaging Mystery," 9 July 2018 As Tollefson notes, the Mount Pinatubo eruption also sped up depletion of the ozone layer; the team hopes that calcium carbonate will have less ozone impact. Dylan Matthews, Vox, "Geoengineering is a last-ditch option to stall global warming — and it’s getting a first test," 30 Nov. 2018 A couple months ago, an atmospheric study revealed that someone had started producing an ozone-depleting pollutant that had been banned under an international agreement to protect the ozone layer. Scott K. Johnson, Ars Technica, "Sources of banned CFCs found through their advertising," 9 July 2018 Remember a couple months ago when scientists said someone was mysteriously making CFCs again, breaking the global ban and threatening the timely recovery of the ozone layer? Alan Murray, Fortune, "Xiaomi Flop, Brexit Resignation, Formula Lobbying: CEO Daily for July 9, 2018," 9 July 2018 But evidence has been building that the ozone layer is recovering, and a new paper claims to have directly measured the ozone hole gradually filling back in. John Timmer, Ars Technica, "New measurement confirms: The ozone is coming back," 4 Jan. 2018 Nearly two dozen scientists are raising doubts about whether the Earth’s ozone layer is recovering as much as some believe. Dino Grandoni, Washington Post, "The Energy 202: Democratic senators demand Pruitt recuse himself from rewriting Clean Power Plan," 7 Feb. 2018 Overall, atmospheric CFCs are still declining, and the ozone layer is still replenishing itself. Rafi Letzter, Scientific American, "Earth’s Ozone Layer is Under Attack—Again," 22 May 2018 Over the second half of the 20th century, the Earth's ozone layer grew increasingly thinner, and in some places disappeared entirely. Avery Thompson, Popular Mechanics, "Investigation Finds China Behind Ozone-Damaging Mystery," 9 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ozone layer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ozone layer

1927, in the meaning defined above

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Time Traveler for ozone layer

The first known use of ozone layer was in 1927

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More Definitions for ozone layer

ozone layer


English Language Learners Definition of ozone layer

: a layer of ozone in the upper atmosphere that prevents dangerous radiation from the Sun from reaching the surface of the Earth

ozone layer


Kids Definition of ozone layer

: a layer of the earth's upper atmosphere that is characterized by high ozone content which blocks most of the sun's ultraviolet radiation from entering the lower atmosphere

More from Merriam-Webster on ozone layer

Britannica.com: Encyclopedia article about ozone layer

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to mark by some ceremony or observation

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