EPA Section 608 Universal Certification ExamCoreMedium
Which of the following statements accurately describes the primary environmental impact of hydrofluorocarbons (HFCs) like R-410A and R-134a?
- AThey deplete the stratospheric ozone layer.
- BThey cause acid rain when released into the atmosphere.
- CThey contribute significantly to global warming.
- DThey lead to smog formation in urban areas.
Show answer & explanationAnswer & explanation
Correct answer: C. They contribute significantly to global warming.
HFCs have zero Ozone Depletion Potential (ODP), meaning they do not harm the ozone layer. However, they have high Global Warming Potentials (GWP), making them potent greenhouse gases that contribute significantly to climate change and global warming.
Why the other options are wrong
- A. This is incorrect; HFCs have zero ODP. CFCs and HCFCs deplete the ozone layer.
- B. Acid rain is primarily caused by sulfur dioxide and nitrogen oxides, not HFCs.
- D. Smog is formed by reactions of volatile organic compounds and nitrogen oxides, not directly by HFCs.
HFC Environmental Impact
Hydrofluorocarbons (HFCs) are refrigerants with zero Ozone Depletion Potential (ODP), meaning they do not harm the ozone layer. However, they have high Global Warming Potentials (GWP), making them significant contributors to climate change and global warming.
- Zero ODP.
- High GWP.
- Subject to HFC phasedown under Kigali Amendment.
Memory trick: HFCs: No ozone hole, but a warmer globe.