EPA 608 Practice Test

Most Missed EPA 608 Questions

These are the EPA 608 practice questions that people on Tigertest get wrong most often, from the answers of 9 people. Each one shows the share who missed it, the right answer and why.

Updated 2026-11-12 by the Tigertest team. Based on 40 CFR Part 82 Subpart F and the EPA Section 608 test outline. Each real section is 25 questions, 18 to pass.

1. 57% of people missed this (21 answers)

   1. When a free chlorine atom released from a CFC molecule strikes an ozone molecule, what is formed?

   • A.Chlorine dioxide and a new ozone molecule
   • B.Chlorine monoxide and an oxygen molecule
   • C.Hydrochloric acid and carbon dioxide
   • D.Fluorine gas and water vapor

   Answer: B. Cl + O3 forms ClO + O2; the ClO then reacts with a free oxygen atom and releases the chlorine atom again. Because chlorine is regenerated, one atom can destroy roughly 100,000 ozone molecules.

2. 53% of people missed this (15 answers)

   2. Since what date has the Clean Air Act prohibited knowingly venting CFC and HCFC refrigerants during service, maintenance, or disposal?

   • A.November 15, 1995
   • B.January 1, 2010
   • C.November 14, 1994
   • D.July 1, 1992

   Answer: D. Section 608 of the Clean Air Act made it illegal to knowingly vent ozone-depleting refrigerants as of July 1, 1992 (40 CFR 82.154(a)). Only de minimis releases during good-faith recovery are allowed.

3. 62% of people missed this (13 answers)

   3. Recovery and recycling equipment manufactured after November 15, 1993 must be certified by an EPA-approved laboratory to which standard?

   • A.AHRI Standard 740
   • B.AHRI Standard 700
   • C.UL Standard 1995
   • D.ASHRAE Standard 15

   Answer: A. Recovery equipment built after November 15, 1993 must be certified to AHRI (formerly ARI) Standard 740 by an EPA-approved testing organization (40 CFR 82.158). AHRI 700 is the purity specification for reclaimed refrigerant.

4. 47% of people missed this (15 answers)

   4. Halons used in fire suppression contain bromine. How does bromine compare with chlorine in destroying stratospheric ozone?

   • A.It only harms ozone in the troposphere
   • B.It is less destructive than chlorine
   • C.It is far more destructive per atom
   • D.It does not react with ozone at all

   Answer: C. Bromine destroys ozone through the same catalytic cycle as chlorine but is many times more effective per atom. That is why halons have much higher ozone depletion potentials than CFCs.

5. 64% of people missed this (11 answers)

   5. Under EPA's Section 608 definitions, a low-pressure appliance uses a refrigerant with which property?

   • A.Liquid saturation pressure above 170 psig at 104 F
   • B.Critical temperature below normal indoor room temperature
   • C.Liquid saturation pressure below 45 psia at 104 F
   • D.Boiling point below minus 50 F at atmospheric pressure

   Answer: C. 40 CFR 82.152 defines a low-pressure appliance as one using a refrigerant with a liquid-phase saturation pressure below 45 psia at 104 F, such as R-11 or R-123.