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skos:definition |
MSH: The unstable triatomic form of oxygen, O3. It is a powerful oxidant that is produced for various chemical and industrial uses. Its production is also catalyzed in the ATMOSPHERE by ULTRAVIOLET RAY irradiation of oxygen or other ozone precursors such as VOLATILE ORGANIC COMPOUNDS and NITROGEN OXIDES. About 90% of the ozone in the atmosphere exists in the stratosphere (STRATOSPHERIC OZONE).,CSP: triatomic form of oxygen, O3; a pungent, unstable blue gas that in the upper atmosphere forms a protective layer against excess ultraviolet radiation and is an ingredient of photochemical smog in the lower atmosphere; used in the purification of drinking water and as an oxidizing agent.,MEDLINEPLUS: <p>Ozone is a gas. It can be good or bad, depending on where it is. "Good" ozone occurs naturally about 10 to 30 miles above the Earth's surface. It shields us from the sun's ultraviolet rays. Part of the good ozone layer is gone - destroyed by man-made chemicals. Without enough good ozone, people may get too much ultra
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