SkillCat EPA 608 PRACTICE QUESTIONS COMPLETE &
ACCURATE EXAM APPROVED QUESTIONS AND
CORRECT VERIFIED SOLUTIONS (100% CORRECT
VERIFIED ANSWERS) CURRENTLY UPDATED
VERSION 2026 EDITION |GUARANTEED PASS
What is the primary source of Chlorine in the stratosphere
ANSWERS: Emissions of refrigerants by human like cfc and hcfc
Rationale for the Correct Answer (Human Emissions)
According to the EPA and the underlying atmospheric science
evaluated in the Section 608 exam:
The Stability of CFCs/HCFCs: Unlike natural chlorine
compounds, human-made CFCs (like R-12) and HCFCs (like
R-22) are chemically extremely stable. They do not
dissolve in water, meaning they cannot be washed out of
the lower atmosphere by rain or storms.
The Journey to the Stratosphere: Because they do not
break down in the lower atmosphere, these molecules
slowly drift upward over several years into the
stratosphere (the ozone layer).
Solar Radiation Breakdown: Once in the stratosphere,
intense ultraviolet (UV) radiation from the sun hits the CFC
or HCFC molecule, breaking its chemical bonds and
releasing free chlorine atoms.
The Catalytic Destruction Cycle: A single free chlorine atom
acts as a catalyst. It can destroy up to 100,000 ozone
(\(O_{3}\)) molecules by stripping away an oxygen atom
to form Chlorine Monoxide (\(ClO\)), converting ozone
back into ordinary oxygen (\(O_{2}\)). Because the
chlorine atom is regenerated at the end of each cycle, it
continues its destructive path for decades.
What molecule destroys the ozone layer
ANSWERS: Chlorine
Rationale for the Correct Answer (Chlorine)
According to the EPA 608 core curriculum, human-made
refrigerants like Chlorofluorocarbons (CFCs) and Hydro
chlorofluoro carbons (HCFCs) transport chlorine safely past
the lower atmosphere because they are chemically stable.
Once they reach the stratosphere, the process of ozone
destruction unfolds in a specific cycle:
, UV Breakdown: Intense ultraviolet (UV) radiation from the
sun strikes the CFC or HCFC molecule, breaking its chemical
bonds and releasing a free chlorine atom
The Ozone Tear-Down: This free chlorine atom is highly
reactive. It collides with an ozone molecule
(\(\text{O}_{3}\)) and strips away one of its three
oxygen atoms. This converts the ozone molecule into a
standard oxygen molecule (\(\text{O}_{2}\)) and leaves
behind Chlorine Monoxide (\(\text{ClO
The Catalytic Cycle: The Chlorine Monoxide
(\(\text{ClO}\)) then encounters a free oxygen atom in
the stratosphere. The free oxygen pulls the oxygen away
from the chlorine, forming another \(\text{O}_{2}\)
molecule and releasing the chlorine atom back into the
wild.
100,000 to 1 Ratio: Because the chlorine atom is not
destroyed or permanently changed during this reaction, it
acts as a catalyst. A single chlorine atom can continuously
repeat this cycle, destroying up to 100,000 ozone
molecules before it finally drifts away or binds with other
chemicals. [
Which of the following are effects of the ozone layer depletion
ANSWERS: Decreasing crop yields and threat to wild and marine life
Rationale for the Correct Answer
When human-made chemicals like CFCs and HCFCs destroy stratospheric ozone,
more harmful Ultraviolet-B (UV-B) radiation penetrates the atmosphere and
reaches the Earth's surface. This spike in UV-B radiation has direct, devastating
impacts on ecosystems:
Decreased Crop Yields: Increased UV-B radiation physically damages plant
tissues, disrupts photosynthesis, and stunts plant growth. This leads to drastically
reduced agricultural yields for critical global food crops like rice, wheat, corn, and
soybeans.
Disruption of Marine Life: UV-B radiation penetrates the surface of the ocean,
where it kills or damages phytoplankton and zooplankton. Because phytoplankton
form the baseline foundation of the entire aquatic food chain, their decline triggers a
collapse that threatens fish populations, marine mammals, and commercial fisheries.
Threat to Wild Ecosystems: Increased radiation harms the eggs and larvae of
amphibians (like frogs and salamanders) and alters natural habitats, disrupting the
delicate ecological balance.
Who does ozone depletion affect
ANSWERS:People all over the world
Rationale for the Correct Answer
The destruction of the ozone layer impacts every geographic region and
population on the planet due to the global nature of atmospheric
mechanics: [
Atmospheric Circulation: Refrigerants like CFCs and HCFCs released
, in one specific city or country do not stay there. They disperse evenly
throughout the global lower atmosphere and are carried by planetary wind
currents into the stratosphere worldwide.
Global Increase in UV Radiation: While the ozone thins most severely
over the polar regions (creating the "ozone hole"), the overall thinning
reduces the protective blanket across the entire globe. As a result,
harmful Ultraviolet-B (UV-B) radiation increases everywhere, affecting
humans, crops, and ecosystems across all continents and oceans
regardless of where the refrigerants were originally emitted.
After refrigerant is phased out can equipment still contain
refrigerant
Answers: Yes
After refrigerant is phased out can technicians service equipment
containing that refrigerant
Answers: Yes
After being phased out, where can technicians obtain
refrigerant to service equipment that contains that
refrigerant?
ANSWERS: From recovered or reclaimed refrigerant
When the EPA completely phases out a class of refrigerant under the Clean Air Act
and the Montreal Protocol, it does not make the possession or operation of that
equipment illegal. Instead, it cuts off the supply chain of newly manufactured (virgin)
gas. Technicians must rely on the existing, recycled supply pool
The Ban on Virgin Production: Once a phase-out date passes, chemical
manufacturers are legally prohibited from producing new virgin refrigerant, and
importers cannot bring new gas into the country.
Recovered Refrigerant (Same Owner Rule): Technicians can recover refrigerant
from one system and put it directly back into another system provided that both
systems belong to the same equipment owner. ,
Reclaimed Refrigerant (Resale Standard): If refrigerant is collected from various
systems and intended to be sold to a different owner, it must be sent to an EPA-
certified reclaimer. The reclaimer chemically distills and tests the gas to ensure it
meets AHRI Standard 740 (purity levels equivalent to brand-new virgin gas). Only
then can it be legally resold on the open market to technicians servicing legacy
equipment.
, Can refrigerant be resold
ANSWERS: Yes, but only if it has been reclaimed to AHRI Standard 700
specifications
Rationale for the Correct Answer
The EPA strictly prohibits the resale of used, unpurified refrigerant to ensure
environmental safety and equipment protection:
The AHRI 700 Purity Benchmark: Before any used refrigerant can change hands
or be resold on the open market, it must be sent to an EPA-certified reclaimer. The
reclaimer processes the gas through chemical distillation and laboratory testing to
ensure it meets AHRI Standard 700 (purity standards equal to 99.5% pure, brand-
new virgin refrigerant).
The Same-Owner Exemption: The only exception to the reclamation rule is if a
technician recovers refrigerant from one system and charges it into another system
owned by the exact same company or individual. Because no change of
ownership occurs, it does not need to be reclaimed, though it should still be filtered
for safety.
The Sales Restriction: Under Section 608, buying virgin or reclaimed refrigerant is
restricted exclusively to EPA-certified technicians. It is illegal to sell refrigerant to any
uncertified individual.
ACCURATE EXAM APPROVED QUESTIONS AND
CORRECT VERIFIED SOLUTIONS (100% CORRECT
VERIFIED ANSWERS) CURRENTLY UPDATED
VERSION 2026 EDITION |GUARANTEED PASS
What is the primary source of Chlorine in the stratosphere
ANSWERS: Emissions of refrigerants by human like cfc and hcfc
Rationale for the Correct Answer (Human Emissions)
According to the EPA and the underlying atmospheric science
evaluated in the Section 608 exam:
The Stability of CFCs/HCFCs: Unlike natural chlorine
compounds, human-made CFCs (like R-12) and HCFCs (like
R-22) are chemically extremely stable. They do not
dissolve in water, meaning they cannot be washed out of
the lower atmosphere by rain or storms.
The Journey to the Stratosphere: Because they do not
break down in the lower atmosphere, these molecules
slowly drift upward over several years into the
stratosphere (the ozone layer).
Solar Radiation Breakdown: Once in the stratosphere,
intense ultraviolet (UV) radiation from the sun hits the CFC
or HCFC molecule, breaking its chemical bonds and
releasing free chlorine atoms.
The Catalytic Destruction Cycle: A single free chlorine atom
acts as a catalyst. It can destroy up to 100,000 ozone
(\(O_{3}\)) molecules by stripping away an oxygen atom
to form Chlorine Monoxide (\(ClO\)), converting ozone
back into ordinary oxygen (\(O_{2}\)). Because the
chlorine atom is regenerated at the end of each cycle, it
continues its destructive path for decades.
What molecule destroys the ozone layer
ANSWERS: Chlorine
Rationale for the Correct Answer (Chlorine)
According to the EPA 608 core curriculum, human-made
refrigerants like Chlorofluorocarbons (CFCs) and Hydro
chlorofluoro carbons (HCFCs) transport chlorine safely past
the lower atmosphere because they are chemically stable.
Once they reach the stratosphere, the process of ozone
destruction unfolds in a specific cycle:
, UV Breakdown: Intense ultraviolet (UV) radiation from the
sun strikes the CFC or HCFC molecule, breaking its chemical
bonds and releasing a free chlorine atom
The Ozone Tear-Down: This free chlorine atom is highly
reactive. It collides with an ozone molecule
(\(\text{O}_{3}\)) and strips away one of its three
oxygen atoms. This converts the ozone molecule into a
standard oxygen molecule (\(\text{O}_{2}\)) and leaves
behind Chlorine Monoxide (\(\text{ClO
The Catalytic Cycle: The Chlorine Monoxide
(\(\text{ClO}\)) then encounters a free oxygen atom in
the stratosphere. The free oxygen pulls the oxygen away
from the chlorine, forming another \(\text{O}_{2}\)
molecule and releasing the chlorine atom back into the
wild.
100,000 to 1 Ratio: Because the chlorine atom is not
destroyed or permanently changed during this reaction, it
acts as a catalyst. A single chlorine atom can continuously
repeat this cycle, destroying up to 100,000 ozone
molecules before it finally drifts away or binds with other
chemicals. [
Which of the following are effects of the ozone layer depletion
ANSWERS: Decreasing crop yields and threat to wild and marine life
Rationale for the Correct Answer
When human-made chemicals like CFCs and HCFCs destroy stratospheric ozone,
more harmful Ultraviolet-B (UV-B) radiation penetrates the atmosphere and
reaches the Earth's surface. This spike in UV-B radiation has direct, devastating
impacts on ecosystems:
Decreased Crop Yields: Increased UV-B radiation physically damages plant
tissues, disrupts photosynthesis, and stunts plant growth. This leads to drastically
reduced agricultural yields for critical global food crops like rice, wheat, corn, and
soybeans.
Disruption of Marine Life: UV-B radiation penetrates the surface of the ocean,
where it kills or damages phytoplankton and zooplankton. Because phytoplankton
form the baseline foundation of the entire aquatic food chain, their decline triggers a
collapse that threatens fish populations, marine mammals, and commercial fisheries.
Threat to Wild Ecosystems: Increased radiation harms the eggs and larvae of
amphibians (like frogs and salamanders) and alters natural habitats, disrupting the
delicate ecological balance.
Who does ozone depletion affect
ANSWERS:People all over the world
Rationale for the Correct Answer
The destruction of the ozone layer impacts every geographic region and
population on the planet due to the global nature of atmospheric
mechanics: [
Atmospheric Circulation: Refrigerants like CFCs and HCFCs released
, in one specific city or country do not stay there. They disperse evenly
throughout the global lower atmosphere and are carried by planetary wind
currents into the stratosphere worldwide.
Global Increase in UV Radiation: While the ozone thins most severely
over the polar regions (creating the "ozone hole"), the overall thinning
reduces the protective blanket across the entire globe. As a result,
harmful Ultraviolet-B (UV-B) radiation increases everywhere, affecting
humans, crops, and ecosystems across all continents and oceans
regardless of where the refrigerants were originally emitted.
After refrigerant is phased out can equipment still contain
refrigerant
Answers: Yes
After refrigerant is phased out can technicians service equipment
containing that refrigerant
Answers: Yes
After being phased out, where can technicians obtain
refrigerant to service equipment that contains that
refrigerant?
ANSWERS: From recovered or reclaimed refrigerant
When the EPA completely phases out a class of refrigerant under the Clean Air Act
and the Montreal Protocol, it does not make the possession or operation of that
equipment illegal. Instead, it cuts off the supply chain of newly manufactured (virgin)
gas. Technicians must rely on the existing, recycled supply pool
The Ban on Virgin Production: Once a phase-out date passes, chemical
manufacturers are legally prohibited from producing new virgin refrigerant, and
importers cannot bring new gas into the country.
Recovered Refrigerant (Same Owner Rule): Technicians can recover refrigerant
from one system and put it directly back into another system provided that both
systems belong to the same equipment owner. ,
Reclaimed Refrigerant (Resale Standard): If refrigerant is collected from various
systems and intended to be sold to a different owner, it must be sent to an EPA-
certified reclaimer. The reclaimer chemically distills and tests the gas to ensure it
meets AHRI Standard 740 (purity levels equivalent to brand-new virgin gas). Only
then can it be legally resold on the open market to technicians servicing legacy
equipment.
, Can refrigerant be resold
ANSWERS: Yes, but only if it has been reclaimed to AHRI Standard 700
specifications
Rationale for the Correct Answer
The EPA strictly prohibits the resale of used, unpurified refrigerant to ensure
environmental safety and equipment protection:
The AHRI 700 Purity Benchmark: Before any used refrigerant can change hands
or be resold on the open market, it must be sent to an EPA-certified reclaimer. The
reclaimer processes the gas through chemical distillation and laboratory testing to
ensure it meets AHRI Standard 700 (purity standards equal to 99.5% pure, brand-
new virgin refrigerant).
The Same-Owner Exemption: The only exception to the reclamation rule is if a
technician recovers refrigerant from one system and charges it into another system
owned by the exact same company or individual. Because no change of
ownership occurs, it does not need to be reclaimed, though it should still be filtered
for safety.
The Sales Restriction: Under Section 608, buying virgin or reclaimed refrigerant is
restricted exclusively to EPA-certified technicians. It is illegal to sell refrigerant to any
uncertified individual.
