EPA 608 609 - EPA Refrigerant Handling Ozone Depletion and Regulations Questions and Answers 2 — Questions and Answers
Question 1: Which international agreement established the framework for phasing out ozone-depleting substances including CFCs and HCFCs?
- The Kyoto Protocol
- The Paris Agreement
- The Montreal Protocol (Correct answer)
- The Clean Air Act Amendments of 1990
Correct answer: The Montreal Protocol
The Montreal Protocol, signed in 1987, is the international treaty that established binding schedules for phasing out the production and consumption of ozone-depleting substances including CFCs and HCFCs. The United States implemented the protocol's requirements through the Clean Air Act Amendments of 1990, which created Section 608.
Question 2: What property of CFC refrigerants makes them particularly damaging to the stratospheric ozone layer?
- They have a very high global warming potential
- They contain stable chlorine atoms that are released in the upper atmosphere (Correct answer)
- They react with UV radiation to produce nitrous oxide
- They are heavier than air and accumulate near the ozone layer
Correct answer: They contain stable chlorine atoms that are released in the upper atmosphere
CFC molecules contain chlorine atoms bonded in a very stable molecular structure. When CFCs reach the stratosphere, UV radiation breaks these bonds, releasing free chlorine atoms. Each chlorine atom can destroy thousands of ozone molecules through a catalytic chain reaction, causing significant ozone depletion.
Question 3: What is the Ozone Depletion Potential (ODP) of R-11?
- 0.5
- 0.8
- 1.0 (Correct answer)
- 1.5
Correct answer: 1.0
R-11 (CFC-11, trichlorofluoromethane) has an ODP of 1.0 and is used as the reference standard against which all other refrigerants are measured. An ODP of 1.0 means R-11 destroys as much ozone as the reference compound. Refrigerants with higher ODPs are more damaging; HFCs have an ODP of zero.
Question 4: Under the EPA's venting prohibition under Section 608, which of the following refrigerants is NOT subject to the prohibition?
- R-22 (HCFC)
- R-410A (HFC)
- R-134a (HFC)
- CO2 (R-744) used as a refrigerant substitute (Correct answer)
Correct answer: CO2 (R-744) used as a refrigerant substitute
The EPA's venting prohibition under Section 608 applies to CFCs, HCFCs, and HFCs used as refrigerants. The EPA has not extended the venting prohibition to substitute refrigerants like CO2 (R-744) in the same regulatory framework, though responsible handling is always expected. CFCs, HCFCs, and HFCs are all subject to the ban.
Question 5: What was the U.S. production phase-out date for R-22 (HCFC-22)?
- January 1, 2010
- January 1, 2015
- January 1, 2020 (Correct answer)
- January 1, 2025
Correct answer: January 1, 2020
The United States phased out domestic production and import of R-22 (HCFC-22) on January 1, 2020. After this date, only reclaimed or recycled R-22 can be used to service existing equipment. New equipment using R-22 was phased out beginning in 2010, and the complete production ban took effect in 2020.
Question 6: Which layer of the Earth's atmosphere contains the ozone layer that protects life from harmful UV radiation?
- Troposphere
- Stratosphere (Correct answer)
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer is located in the stratosphere, approximately 15 to 35 kilometers above Earth's surface. This layer absorbs the majority of the sun's harmful ultraviolet-B and ultraviolet-C radiation. Depletion of stratospheric ozone by chlorine and bromine from refrigerants allows more UV radiation to reach the surface, increasing cancer and ecosystem risks.
EPA 608 609 - EPA Refrigerant Handling Ozone Depletion and Regulations Questions and Answers 2
Which international agreement established the framework for phasing out ozone-depleting substances including CFCs and HCFCs?