EPA 608 609 Ozone Depletion and Regulations 2

Question 1

Which atmospheric layer contains the ozone that protects life from harmful ultraviolet radiation?

Accepted Answer

Stratosphere

Answer

The protective ozone layer is located in the stratosphere.

Question 2

What element released from CFCs is primarily responsible for destroying ozone molecules?

Accepted Answer

Chlorine

Answer

Chlorine atoms released from CFCs catalytically destroy ozone.

Question 3

A single chlorine atom can destroy approximately how many ozone molecules before becoming inactive?

Accepted Answer

Up to 100,000

Answer

One chlorine atom can destroy up to 100,000 ozone molecules in a catalytic cycle.

Question 4

Which international agreement first set a schedule to phase out ozone-depleting substances?

Accepted Answer

Montreal Protocol

Answer

The Montreal Protocol of 1987 established the phaseout of ozone-depleting substances.

Question 5

Under U.S. regulations, what is the common term for the rating that compares a substance's ozone destruction to CFC-11?

Accepted Answer

Ozone Depletion Potential

Answer

Ozone Depletion Potential (ODP) measures a substance's ozone harm relative to CFC-11.

EPA 608 609 Practice Test