1
: a triatomic very reactive form of oxygen that is a bluish irritating gas of pungent odor, that is a major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere, and that is used for oxidizing, bleaching, disinfecting, and deodorizing
2
: pure and refreshing air
relished the ozone of morning
Examples of ozone in a Sentence
Scientists are concerned about ozone depletion.
A light breeze filled the rooms of our seaside cottage with ozone.
Recent Examples on the Web
Additionally, rising temperatures can worsen ground-level ozone pollution, which presents additional health risks.
—
Joe Edwards, MSNBC Newsweek, 11 July 2025
The federal limit for smog — or ozone pollution near the ground — is 0.070 parts per million.
—Quinn Clark, jsonline.com, 7 July 2025
Air monitoring sites are color-coded based on the pollutant (ozone or particulate matter) with the highest value.
—Tanya Wildt, Freep.com, 5 July 2025
On Friday, July 4, and Saturday, July 5, the AQI will reach levels up to 110, meaning ozone or other major air pollutants are expected to reach levels considered unhealthy for sensitive groups.
—Hailey Roden, The Enquirer, 4 July 2025
See All Example Sentences for ozone
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Joe Edwards, MSNBC Newsweek, 11 July 2025
The federal limit for smog — or ozone pollution near the ground — is 0.070 parts per million.
—Quinn Clark, jsonline.com, 7 July 2025
Air monitoring sites are color-coded based on the pollutant (ozone or particulate matter) with the highest value.
—Tanya Wildt, Freep.com, 5 July 2025
On Friday, July 4, and Saturday, July 5, the AQI will reach levels up to 110, meaning ozone or other major air pollutants are expected to reach levels considered unhealthy for sensitive groups.
—Hailey Roden, The Enquirer, 4 July 2025
See All Example Sentences for ozone
Cite this Entry
“Ozone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ozone. Accessed 25 Jul. 2025.
Copy CitationKids Definition
ozone
noun1
: a form of oxygen that is a bluish irritating sharp-smelling gas containing three atoms per molecule, and that is used especially in disinfecting, deodorizing, and bleaching
2
: pure and refreshing air
Medical Definition
ozone
noun
: a triatomic very reactive form of oxygen that is a bluish irritating gas of pungent odor, that is formed naturally in the atmosphere by a photochemical reaction and is a major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere, and that is used for oxidizing, bleaching, disinfecting, and deodorizing
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