EPA 608 Universal Certification (Core)
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Which layer of the atmosphere contains the most ozone? - ANSWERS-The
stratosphere contains the greatest concentration of ozone, forming the primary
protective layer high above Earth.
Hydrofluorocarbons (HFCs) - ANSWERS-A class of synthetic refrigerant chemicals
made of hydrogen, fluorine, and carbon with no chlorine, introduced mainly in the late
1980s and 1990s to replace ozone damaging substances eliminated under international
environmental agreements. They are widely used in air conditioning, refrigeration, foam
blowing, and aerosol propellants. Because they contain no chlorine, they do not harm
the protective upper atmospheric layer, which made them an important transitional
substitute. However, many have extremely high global warming potential, sometimes
hundreds to thousands of times greater than carbon dioxide, meaning they significantly
contribute to climate change if released. Because of this climate impact, international
and national regulations now control and phase down their production and use while
encouraging safer low global warming alternatives.
Equipment used to service systems with ozone depleting refrigerants must: -
ANSWERS-Be certified by an EPA-approved testing organization. Equipment must be
up to EPA standards to eliminate the risk of accidentally releasing refrigerant.
,What are the two main organizations that are allowed by the EPA to certify equipment?
- ANSWERS-The Air-conditioning, Heating and Refrigeration Institute (AHRI), and
Underwriters Laboratories (UL).
Who needs to keep proper records of refrigerants? - ANSWERS-Owners and operators
of appliances that contain large quantities of regulated refrigerant must keep records of
servicing, leak repair, leak inspections, and the amount of refrigerant added or removed.
Certified technicians and companies performing service must document recovery,
recycling, repair actions, and disposal activities when required. Reclaim facilities must
keep laboratory and processing records showing that used product was restored to
required purity. Sellers and distributors must keep records showing that refrigerant was
sold only to certified individuals or organizations. These records help verify compliance
with environmental regulations and prevent illegal release.
Refrigerant records must document: - ANSWERS-They must document the type and
amount of refrigerant added or removed, when servicing or maintenance occurred, who
performed the work and their certification, leak repair actions and verification tests when
required, leak inspection results for applicable systems, recovery and recycling
activities, and proper handling or disposal of appliances. For sellers and distributors,
records must show that refrigerant was sold only to certified buyers. These records
prove compliance with environmental law and help prevent illegal release.
Mixing Refrigerants - ANSWERS-Don't do it. Refrigerants that have been mixed
together most likely cannot be reprocessed. The owner of the refrigerants will most
likely have to pay for the mixture to be destroyed.
What is ozone in the troposphere typically found as? - ANSWERS-Typically present as
a harmful ground level pollutant, acting as a main component of smog created from
sunlight reacting with vehicle and industrial emissions.
Smog - ANSWERS-A polluted atmospheric condition created when sunlight reacts with
emissions from vehicles, industry, and other sources, producing irritating and harmful
gases and particles that reduce visibility and negatively affect breathing, health, and the
environment.
What are the two main types of ozone? - ANSWERS-Stratospheric ozone and
tropospheric ozone.
,Stratospheric Ozone - ANSWERS-The naturally occurring protective concentration of
ozone found high above Earth in the middle atmospheric layer, where it absorbs and
filters most of the Sun's harmful ultraviolet radiation, helping protect human health,
animals, and plant life.
Tropospheric Ozone - ANSWERS-A ground level form of ozone created mainly when
sunlight reacts with emissions from vehicles, industrial activities, and other pollution
sources. It does not provide protection from ultraviolet radiation and instead acts as an
air pollutant that contributes to smog, irritates lungs, reduces breathing ability, and
harms plants and materials.
Hydrochlorofluorocarbons (HCFCs) - ANSWERS-Man made refrigerant chemicals that
contain hydrogen, chlorine, fluorine, and carbon. They are less damaging to the
protective upper atmospheric layer than older chlorine based compounds because
hydrogen makes them break down sooner in the lower atmosphere. However, they still
have ozone depletion potential and contribute to global warming, so they are being
phased out under international and national environmental regulations.
When did scientists discover CFCs were destroying ozone? - ANSWERS-In the mid
1970s, especially after a 1974 scientific publication showed that chlorine from these
compounds could break down the protective upper atmospheric layer, leading to
worldwide concern and later confirmation in the 1980s.
Why are CFCs more harmful than HCFCs? - ANSWERS-Because they are extremely
stable and do not break down in the lower atmosphere, they survive long enough to
reach the stratosphere where ultraviolet radiation releases chlorine that destroys large
amounts of the protective layer. They contain no hydrogen, so there is nothing to help
them decompose sooner. This long lifetime and high chlorine content gives them a
much higher ozone depletion potential compared to hydrogen containing replacements
that tend to break apart earlier and cause less damage.
How long do CFCs last in the atmosphere? - ANSWERS-They can remain for extremely
long periods, often several decades to over a century, with some lasting more than 100
years in the atmosphere before breaking down.
, How many ozone molecules can a single chlorine atom destroy? - ANSWERS-A single
chlorine atom can break down roughly 100,000 ozone molecules before it is finally
removed from the atmosphere.
What are the two main health problems created by increased exposure to UV? -
ANSWERS-Skin cancer and eye damage such as cataracts.
Clean Air Act (CAA) - ANSWERS-Was first passed in 1963 and significantly
strengthened in 1970, 1977, and 1990. It is administered by the U.S. Environmental
Protection Agency (EPA) and serves as the foundation of air pollution control in the
United States. The Act's main goal is to protect public health and the environment by
regulating emissions of harmful air pollutants from industries, vehicles, and other
sources.
Environmental Protection Agency (EPA) - ANSWERS-A United States federal
government organization responsible for protecting human health and the environment
by enforcing national environmental laws, setting pollution standards, regulating
industries and chemicals, overseeing compliance, and promoting programs that reduce
harm to air, water, and land.
Atom - ANSWERS-The smallest unit of matter that retains the chemical identity of an
element. It consists of a central nucleus made of protons and neutrons, with electrons
moving in regions around the nucleus. It forms the basic building block for all
substances and participates in chemical bonding and reactions.
Ozone - ANSWERS-A form of oxygen made of three bonded oxygen atoms that occurs
naturally in the upper atmosphere where it absorbs harmful ultraviolet radiation, while at
ground level it can act as a pollutant that irritates lungs and contributes to smog.
Where does ozone accumulate in the atmosphere? - ANSWERS-In the two lowest
layers of Earth's atmosphere; between the stratosphere, and the troposphere. Most of it
is in the stratosphere, forming a concentrated layer high above Earth where it absorbs
ultraviolet radiation.
Chlorofluorocarbons (CFCs) - ANSWERS-Man-made chemical compounds composed
of chlorine, fluorine, and carbon that were widely used in refrigeration, air conditioning,
Exam study guide COMPLETE EXAM
Newest 2026 (DETAILED &
ELABORATED) fully solved (100%
ACCURATE Solutions) Latest 2026\2027
Update Guarantee Pass Exam Graded
A+ | With 100% Correct Answers graded
A+ Guaranteed Success!!
Which layer of the atmosphere contains the most ozone? - ANSWERS-The
stratosphere contains the greatest concentration of ozone, forming the primary
protective layer high above Earth.
Hydrofluorocarbons (HFCs) - ANSWERS-A class of synthetic refrigerant chemicals
made of hydrogen, fluorine, and carbon with no chlorine, introduced mainly in the late
1980s and 1990s to replace ozone damaging substances eliminated under international
environmental agreements. They are widely used in air conditioning, refrigeration, foam
blowing, and aerosol propellants. Because they contain no chlorine, they do not harm
the protective upper atmospheric layer, which made them an important transitional
substitute. However, many have extremely high global warming potential, sometimes
hundreds to thousands of times greater than carbon dioxide, meaning they significantly
contribute to climate change if released. Because of this climate impact, international
and national regulations now control and phase down their production and use while
encouraging safer low global warming alternatives.
Equipment used to service systems with ozone depleting refrigerants must: -
ANSWERS-Be certified by an EPA-approved testing organization. Equipment must be
up to EPA standards to eliminate the risk of accidentally releasing refrigerant.
,What are the two main organizations that are allowed by the EPA to certify equipment?
- ANSWERS-The Air-conditioning, Heating and Refrigeration Institute (AHRI), and
Underwriters Laboratories (UL).
Who needs to keep proper records of refrigerants? - ANSWERS-Owners and operators
of appliances that contain large quantities of regulated refrigerant must keep records of
servicing, leak repair, leak inspections, and the amount of refrigerant added or removed.
Certified technicians and companies performing service must document recovery,
recycling, repair actions, and disposal activities when required. Reclaim facilities must
keep laboratory and processing records showing that used product was restored to
required purity. Sellers and distributors must keep records showing that refrigerant was
sold only to certified individuals or organizations. These records help verify compliance
with environmental regulations and prevent illegal release.
Refrigerant records must document: - ANSWERS-They must document the type and
amount of refrigerant added or removed, when servicing or maintenance occurred, who
performed the work and their certification, leak repair actions and verification tests when
required, leak inspection results for applicable systems, recovery and recycling
activities, and proper handling or disposal of appliances. For sellers and distributors,
records must show that refrigerant was sold only to certified buyers. These records
prove compliance with environmental law and help prevent illegal release.
Mixing Refrigerants - ANSWERS-Don't do it. Refrigerants that have been mixed
together most likely cannot be reprocessed. The owner of the refrigerants will most
likely have to pay for the mixture to be destroyed.
What is ozone in the troposphere typically found as? - ANSWERS-Typically present as
a harmful ground level pollutant, acting as a main component of smog created from
sunlight reacting with vehicle and industrial emissions.
Smog - ANSWERS-A polluted atmospheric condition created when sunlight reacts with
emissions from vehicles, industry, and other sources, producing irritating and harmful
gases and particles that reduce visibility and negatively affect breathing, health, and the
environment.
What are the two main types of ozone? - ANSWERS-Stratospheric ozone and
tropospheric ozone.
,Stratospheric Ozone - ANSWERS-The naturally occurring protective concentration of
ozone found high above Earth in the middle atmospheric layer, where it absorbs and
filters most of the Sun's harmful ultraviolet radiation, helping protect human health,
animals, and plant life.
Tropospheric Ozone - ANSWERS-A ground level form of ozone created mainly when
sunlight reacts with emissions from vehicles, industrial activities, and other pollution
sources. It does not provide protection from ultraviolet radiation and instead acts as an
air pollutant that contributes to smog, irritates lungs, reduces breathing ability, and
harms plants and materials.
Hydrochlorofluorocarbons (HCFCs) - ANSWERS-Man made refrigerant chemicals that
contain hydrogen, chlorine, fluorine, and carbon. They are less damaging to the
protective upper atmospheric layer than older chlorine based compounds because
hydrogen makes them break down sooner in the lower atmosphere. However, they still
have ozone depletion potential and contribute to global warming, so they are being
phased out under international and national environmental regulations.
When did scientists discover CFCs were destroying ozone? - ANSWERS-In the mid
1970s, especially after a 1974 scientific publication showed that chlorine from these
compounds could break down the protective upper atmospheric layer, leading to
worldwide concern and later confirmation in the 1980s.
Why are CFCs more harmful than HCFCs? - ANSWERS-Because they are extremely
stable and do not break down in the lower atmosphere, they survive long enough to
reach the stratosphere where ultraviolet radiation releases chlorine that destroys large
amounts of the protective layer. They contain no hydrogen, so there is nothing to help
them decompose sooner. This long lifetime and high chlorine content gives them a
much higher ozone depletion potential compared to hydrogen containing replacements
that tend to break apart earlier and cause less damage.
How long do CFCs last in the atmosphere? - ANSWERS-They can remain for extremely
long periods, often several decades to over a century, with some lasting more than 100
years in the atmosphere before breaking down.
, How many ozone molecules can a single chlorine atom destroy? - ANSWERS-A single
chlorine atom can break down roughly 100,000 ozone molecules before it is finally
removed from the atmosphere.
What are the two main health problems created by increased exposure to UV? -
ANSWERS-Skin cancer and eye damage such as cataracts.
Clean Air Act (CAA) - ANSWERS-Was first passed in 1963 and significantly
strengthened in 1970, 1977, and 1990. It is administered by the U.S. Environmental
Protection Agency (EPA) and serves as the foundation of air pollution control in the
United States. The Act's main goal is to protect public health and the environment by
regulating emissions of harmful air pollutants from industries, vehicles, and other
sources.
Environmental Protection Agency (EPA) - ANSWERS-A United States federal
government organization responsible for protecting human health and the environment
by enforcing national environmental laws, setting pollution standards, regulating
industries and chemicals, overseeing compliance, and promoting programs that reduce
harm to air, water, and land.
Atom - ANSWERS-The smallest unit of matter that retains the chemical identity of an
element. It consists of a central nucleus made of protons and neutrons, with electrons
moving in regions around the nucleus. It forms the basic building block for all
substances and participates in chemical bonding and reactions.
Ozone - ANSWERS-A form of oxygen made of three bonded oxygen atoms that occurs
naturally in the upper atmosphere where it absorbs harmful ultraviolet radiation, while at
ground level it can act as a pollutant that irritates lungs and contributes to smog.
Where does ozone accumulate in the atmosphere? - ANSWERS-In the two lowest
layers of Earth's atmosphere; between the stratosphere, and the troposphere. Most of it
is in the stratosphere, forming a concentrated layer high above Earth where it absorbs
ultraviolet radiation.
Chlorofluorocarbons (CFCs) - ANSWERS-Man-made chemical compounds composed
of chlorine, fluorine, and carbon that were widely used in refrigeration, air conditioning,
