O₃

{
  "id": "MLC-T-ENV-019252",
  "term": "O₃",
  "field": "Environment",
  "definition": "While ozone in the stratosphere can help protect us from ultraviolet rays, ground-level ozone poses health risks. Ground-level ozone does not come from a single source, but is formed in the air through a complex series of reactions involving light and chemical precursors like Nitrogen Oxides (NOₓ) and Volatile Organic Compounds (VOCs). Human and naturally occurring processes contribute to Ozone concentrations via NOₓ and VOC emissions. Breathing ozone can trigger a variety of health problems, particularly for children, the elderly, and people with lung diseases such as asthma. Ground level ozone can also have harmful effects on sensitive vegetation and ecosystems.",
  "subject": "Air",
  "references": [
    "CMAQ Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/o3/"
}