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  1. Ozone - Wikipedia

  2. What is Ozone? | US EPA - U.S. Environmental Protection Agency

  3. Ozone | American Lung Association

  4. Ozone | Definition, Properties, Structure, & Facts | Britannica

  5. Nasa Ozone Watch: Ozone facts

  6. Ozone layer facts and information - National Geographic

  7. Ozone Layer - National Geographic Society

  8. Ozone layer | Description, Importance, & Facts | Britannica

  9. Science - Ozone Basics - National Oceanic and Atmospheric …

  10. Ozone Layer - Our World in Data