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EPA 608Free EPA Section 608 Technician Certification practice test
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10 real EPA 608 practice questions with instant answers and explanations — no account, no credit card, no email. Score yourself, then unlock the full bank of 72 questions whenever you’re ready. The EPA 608 passing score is 70% (18 of 25) per section.
Which layer of the atmosphere contains the ozone that shields the surface from harmful ultraviolet radiation?
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All 10 EPA 608 questions & answers
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Q1. Which layer of the atmosphere contains the ozone that shields the surface from harmful ultraviolet radiation?
Correct answer: B. Stratosphere
The protective ozone layer resides in the stratosphere, where it absorbs much of the sun's ultraviolet radiation before it reaches the surface.
Q2. What property of a refrigerant molecule is most directly responsible for its ability to destroy stratospheric ozone?
Correct answer: B. Its chlorine or bromine content
Chlorine and bromine atoms released from a molecule catalyze ozone destruction, so refrigerants containing them have higher ozone-depletion potential.
Q3. Compared with a CFC, why does an HCFC such as R-22 generally have a lower ozone-depletion potential?
Correct answer: B. It contains hydrogen, so it tends to break down lower in the atmosphere before reaching the ozone layer
The hydrogen atoms in an HCFC make the molecule less stable, so much of it decomposes in the lower atmosphere and less chlorine reaches the stratosphere.
Q4. Which class of refrigerants contains no chlorine and therefore has an ozone-depletion potential of essentially zero?
Correct answer: C. HFCs
Hydrofluorocarbons (HFCs) such as R-134a contain no chlorine, giving them an ozone-depletion potential of zero, though they can still have high global-warming potential.
Q5. Under which U.S. law are the Section 608 refrigerant-handling regulations established?
Correct answer: B. The Clean Air Act
Section 608 of the Clean Air Act directs the EPA to establish regulations governing the handling of ozone-depleting and substitute refrigerants.
Q6. The international agreement that set the schedule for phasing out ozone-depleting substances is known as the:
Correct answer: B. Montreal Protocol
The Montreal Protocol is the international treaty that established phase-out timetables for CFCs, HCFCs, and other ozone-depleting substances.
Q7. Under Section 608, knowingly releasing refrigerant to the atmosphere during the service, maintenance, or disposal of an appliance is:
Correct answer: B. Prohibited (venting is not allowed)
The venting prohibition makes it unlawful to knowingly release regulated refrigerants during service, maintenance, or disposal.
Q8. Which of the following releases is specifically NOT considered a violation of the venting prohibition?
Correct answer: B. A small release of nitrogen used to pressurize and leak-check a system that also contains refrigerant
De minimis releases associated with good-faith practices, such as purging nitrogen used for leak testing, are not treated as prohibited venting.
Q9. Under current Section 608 sales restrictions, refrigerant subject to the rule generally may be purchased only by:
Correct answer: B. Certified technicians or entities employing them
The refrigerant sales restriction limits purchases to EPA-certified technicians or businesses that employ them, discouraging improper handling by untrained individuals.
Q10. In the context of refrigerant management, what does 'reclaim' specifically mean?
Correct answer: C. Reprocessing refrigerant to AHRI-700 purity, verified by chemical analysis, typically off site
Reclaimed refrigerant is reprocessed to meet the AHRI Standard 700 purity specification and is chemically analyzed to verify it, generally at an off-site facility.
Exam facts and objectives sourced from the official US EPA (Section 608) certification page. Last reviewed June 2026.
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