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World 5 · The Ozone Layer · 12 min · PRO

The hole and the treaty

The Antarctic hole and the Montreal Protocol

PRO · Planet Fixers

World 5: The Ozone Layer is part of PRO

The first world of Planet Fixers is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

  • A sunscreen in the sky
  • CFCs and the chlorine chain
  • Good up high, bad nearby: ground-level ozone
  • What is in the air? Pollutants and the AQI
  • Tiny particles, big effects: PM2.5 and health
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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