EPA Section 608 Universal Certification ExamCoreHard
Which of the following statements accurately describes the primary environmental concern associated with HFC refrigerants?
- AThey deplete the stratospheric ozone layer significantly.
- BThey cause acid rain when released into the atmosphere.
- CThey primarily lead to ground-level smog formation.
- DThey contribute to global warming due to their high Global Warming Potential (GWP).
Show answer & explanationAnswer & explanation
Correct answer: D. They contribute to global warming due to their high Global Warming Potential (GWP).
HFCs (Hydrofluorocarbons) do not contain chlorine, so they have an Ozone Depletion Potential (ODP) of zero. However, they are potent greenhouse gases with very high Global Warming Potential (GWP), contributing significantly to climate change.
Why the other options are wrong
- A. HFCs have an ODP of zero, so they do not deplete the ozone layer.
- B. Acid rain is primarily caused by sulfur dioxide and nitrogen oxides, not HFCs.
- C. Ground-level smog is mainly formed from volatile organic compounds and nitrogen oxides, not HFCs.
HFC Environmental Impact
Hydrofluorocarbons (HFCs) do not deplete the ozone layer (ODP=0) but are potent greenhouse gases with high Global Warming Potentials (GWP), contributing to climate change.
- ODP = 0 (no chlorine).
- High GWP.
- Potent greenhouse gases.
- Phasing down under Kigali Amendment.
Memory trick: HFCs are 'Hot For Climate' (GWP).