AP Environmental Science - 9.1 & 9.2 Stratospheric Ozone Depletion and Reducing Ozone Depletion

Which of the following is FALSE?

• The ozone layer fully blocks all types of UV radiation.

• Ozone is O₃, and is helpful in the stratosphere but a respiratory irritant in the troposphere. 

• Increased exposure to UV radiation is linked to skin cancer and cataracts. 

• CFCs are a class of chemicals that were used in refrigerants and aerosols that caused ozone depletion. 

Which of the following is FALSE?

• Once a chlorine atom from a CFC has broken an ozone molecule, it is used up and can't destroy any more ozone molecules. 

• Natural ozone depletion happens in the Antarctic spring. 

• Because of the Montreal Protocol, CFCs were phased out of use.  However, many of their replacements like HFCs, are still greenhouse gases. 

• The ozone layer is still thinner than it once was, but has started to recover.