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IB ESS HL 6.4.6 Ozone-depleting substances (ODSs) Question Bank

Practise IB ESS SL/HL 006.004.006 by applying ozone-depleting substances (odss) concepts to exam-style environmental systems questions.

Syllabus
First assessment 2026
Course
ESS HL
Level
HL

Exam points

  • identify the relevant environmental system, process or evidence
  • apply the correct ESS concept and explain the causal relationship
  • evaluate the outcome using ecological, social or management evidence

6.4.6—Ozone-depleting substances (ODSs) question 1

[Maximum number: 1]
Observed and projected changes in global stratospheric ozone

Figure:Observed and projected changes in global stratospheric ozone

Key:
- Annually averaged data
- Average of atmospheric model projections

State one chemical responsible for the trend in the recorded annually averaged data between 1980 and 1990 shown in the stratospheric-ozone chart shown above.

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