The EPA and Clean Air Act · US History

The Clean Air Act has been historically successful in reducing the 'hole' in the ozone layer by regulating:

  1. Carbon dioxide released naturally by volcanic eruptions around the world
  2. Chlorofluorocarbons (CFCs) used in refrigeration and aerosols
  3. The use of wood-burning stoves by households during the winter
  4. The total amount of oxygen that people are allowed to breathe
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Correct answer: Chlorofluorocarbons (CFCs) used in refrigeration and aerosols

Following the Montreal Protocol, the EPA used its authority under the Clean Air Act to phase out CFCs. This action has led to a slow but measurable recovery of the stratospheric ozone layer that protects Earth from UV radiation.

Difficulty: Medium Question 18 of 20

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