EPA SECTION 608 CORE EXAM AND PRACTICE EXAM
NEWEST 2026 TEST BANK| COMPLETE 650 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| EPA SECTION 608 CORE
EXAM PREP 2026 (MOST RECENT!!)
1. What is the chemical formula of a stratospheric ozone
molecule?
A) O₂
B) O₃
C) CO₂
D) ClO
Answer: B) O₃
*Rationale: Ozone is a molecule composed of three oxygen
atoms (O3). This is distinct from the oxygen we breathe (O2). The
1
,stratospheric ozone layer absorbs 95-99% of the sun's harmful
ultraviolet (UV) radiation .*
2. Where is the majority of the Earth’s protective ozone layer
located?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
Rationale: While ozone exists in other atmospheric layers, the
"ozone layer" is specifically located in the stratosphere,
approximately 6 to 30 miles above the Earth's surface .
3. Which atom in a CFC molecule is primarily responsible for
destroying ozone in the stratosphere?
A) Fluorine
B) Carbon
2
,C) Chlorine
D) Hydrogen
Answer: C) Chlorine
Rationale: When UV light breaks down a CFC molecule in the
stratosphere, it releases a chlorine atom. This free chlorine atom
acts as a catalyst, breaking apart thousands of ozone molecules
before it is deactivated .
4. Why do CFCs reach the stratosphere more easily than many
other chemicals?
A) They are heavier than air, so they sink into the upper
atmosphere.
B) They are magnetic and are pulled toward the poles.
C) They are very stable (non-reactive) in the lower atmosphere.
D) They are water-soluble and rise with evaporation.
Answer: C) They are very stable (non-reactive) in the lower
atmosphere.
3
, Rationale: CFCs are chemically inert in the troposphere (lower
atmosphere). They do not break down in rain or air currents,
allowing them to slowly drift up to the stratosphere over many
years .
5. Which of the following health effects is linked to increased
UV radiation due to ozone depletion?
A) Increased rates of asthma
B) Increased cases of skin cancer and cataracts
C) Increased risk of broken bones
D) Increased rates of influenza
Answer: B) Increased cases of skin cancer and cataracts
Rationale: UV-B radiation is known to damage DNA and eye
tissues. The depletion of the ozone layer allows more UV-B to reach
the surface, directly increasing the risk of skin cancer, cataracts,
and immune system suppression .
4
NEWEST 2026 TEST BANK| COMPLETE 650 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+| EPA SECTION 608 CORE
EXAM PREP 2026 (MOST RECENT!!)
1. What is the chemical formula of a stratospheric ozone
molecule?
A) O₂
B) O₃
C) CO₂
D) ClO
Answer: B) O₃
*Rationale: Ozone is a molecule composed of three oxygen
atoms (O3). This is distinct from the oxygen we breathe (O2). The
1
,stratospheric ozone layer absorbs 95-99% of the sun's harmful
ultraviolet (UV) radiation .*
2. Where is the majority of the Earth’s protective ozone layer
located?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
Answer: B) Stratosphere
Rationale: While ozone exists in other atmospheric layers, the
"ozone layer" is specifically located in the stratosphere,
approximately 6 to 30 miles above the Earth's surface .
3. Which atom in a CFC molecule is primarily responsible for
destroying ozone in the stratosphere?
A) Fluorine
B) Carbon
2
,C) Chlorine
D) Hydrogen
Answer: C) Chlorine
Rationale: When UV light breaks down a CFC molecule in the
stratosphere, it releases a chlorine atom. This free chlorine atom
acts as a catalyst, breaking apart thousands of ozone molecules
before it is deactivated .
4. Why do CFCs reach the stratosphere more easily than many
other chemicals?
A) They are heavier than air, so they sink into the upper
atmosphere.
B) They are magnetic and are pulled toward the poles.
C) They are very stable (non-reactive) in the lower atmosphere.
D) They are water-soluble and rise with evaporation.
Answer: C) They are very stable (non-reactive) in the lower
atmosphere.
3
, Rationale: CFCs are chemically inert in the troposphere (lower
atmosphere). They do not break down in rain or air currents,
allowing them to slowly drift up to the stratosphere over many
years .
5. Which of the following health effects is linked to increased
UV radiation due to ozone depletion?
A) Increased rates of asthma
B) Increased cases of skin cancer and cataracts
C) Increased risk of broken bones
D) Increased rates of influenza
Answer: B) Increased cases of skin cancer and cataracts
Rationale: UV-B radiation is known to damage DNA and eye
tissues. The depletion of the ozone layer allows more UV-B to reach
the surface, directly increasing the risk of skin cancer, cataracts,
and immune system suppression .
4
