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22.3: Reducing Air Pollution

Difficulty Level: At Grade Created by: CK-12

Lesson 22.3: True or False

Name___________________ Class______________ Date________

Write true if the statement is true or false if the statement is false.

_____ 1. The Clean Air Act was passed in order to reduce global warming.

_____ 2. Because of the Clean Air Act, air pollution has been eliminated completely.

_____ 3. Pollution by ozone was reduced at least 50 percent by the Montreal Protocol.

_____ 4. Hydrogen cars produce about 10 percent of the air pollution of gas-burning cars.

_____ 5. Some scrubbers use steam to remove pollutants from exhaust.

_____ 6. The Kyoto Protocol has been more successful than the Montreal Protocol.

_____ 7. The size of the hole in the ozone layer has gotten somewhat smaller since 2006.

_____ 8. Cap-and-trade systems were developed to reduce the use of CFCs.

_____ 9. Carbon is sequestered naturally by forests.

_____ 10. The world’s greatest producer of greenhouse gases is the U.S.

Lesson 22.3: Critical Reading

Name___________________ Class______________ Date________

Read this passage based on the text and answer the questions that follow.

Reducing Air Pollution from Fossil Fuels

There are two basic types of strategies for reducing air pollution from fossil fuels. One type of strategy is to reduce our use of fossil fuels. The other type of strategy is to prevent pollution from entering the air when fossil fuels are used.

We can reduce our use of fossil fuels in several ways:

  • We can conserve fossil fuels. For example, turning out lights when we aren’t using them saves electricity. That’s because a lot of the electricity we use comes from coal-burning power plants.
  • We can use fossil fuels more efficiently. For example, driving a fuel-efficient car lets you go farther on each gallon of gas. This can add up to a big savings in fossil fuel use.
  • We can change to alternative energy sources that produce little or no air pollution. For example, hybrid cars run on electricity that the cars produce during braking. These cars use gas only as a backup fuel. As a result, they produce just 10 percent of the air pollution produced by cars that run only on gas. Cars that run on hydrogen produce no pollution at all.

We can prevent pollution from entering the air when fossil fuels are used by removing pollutants from exhaust before it is released into the air. Two widely used technologies are scrubbers and catalytic converters. Scrubbers are used in factories and power plants. They remove particulates and waste gases from exhaust. Catalytic converters are used in motor vehicles. They break down pollutants in exhaust to non-toxic compounds. For example, they change nitrogen oxides to harmless nitrogen and oxygen gasses.


  1. Identify two basic types of strategies for reducing pollution from fossil fuels.
  2. Describe two specific ways we can reduce our use of fossil fuels.
  3. Compare and contrast scrubbers and catalytic converters.

Lesson 22.3: Multiple Choice

Name___________________ Class______________ Date________

Circle the letter of the correct choice.

  1. Pollutants regulated by the Clean Air Act include
    1. CFCs.
    2. carbon dioxide.
    3. carbon monoxide.
    4. all of the above
  2. Air pollutants that destroy ozone high in the atmosphere are regulated by the
    1. Clean Air Act.
    2. Kyoto Protocol.
    3. Montreal Protocol.
    4. none of the above
  3. In a cap-and-trade system, each nation is given a cap on emissions of
    1. CFCs.
    2. carbon dioxide.
    3. nitrogen oxides.
    4. all air pollutants.
  4. Carbon taxes are meant to
    1. encourage people to use less fossil fuel.
    2. reduce carbon dioxide emissions.
    3. control greenhouse gases.
    4. all of the above
  5. Ways of reducing air pollution include
    1. changing pollutants in exhaust to harmless gases.
    2. removing pollutants from exhaust before it is released.
    3. using fossil fuels more efficiently.
    4. all of the above
  6. One purpose of catalytic converters is to
    1. reduce the use of fossil fuels.
    2. remove particulates from exhaust.
    3. break down pollutants to safe compounds.
    4. convert gas-burning cars to hybrid vehicles.
  7. Scrubbers are used in
    1. motor vehicles.
    2. power plants.
    3. factories.
    4. two of the above

Lesson 22.3: Matching

Name___________________ Class______________ Date________

Match each definition with the correct term.


_____ 1. worldwide agreement on air pollution that focuses on CFCs

_____ 2. device that changes pollutants in exhaust gases to non-toxic compounds

_____ 3. worldwide agreement on air pollution that focuses on greenhouse gases

_____ 4. device that filters pollutants from exhaust gases

_____ 5. U.S. law that regulates six major air pollutants

_____ 6. removing carbon dioxide from the atmosphere and storing it in another form

_____ 7. system of limits and allowances on carbon dioxide emissions that can be exchanged between nations


a. scrubber

b. catalytic converter

c. cap-and-trade

d. carbon sequestration

e. Montreal Protocol

f. Kyoto Protocol

g. Clean Air Act

Lesson 22.3: Fill in the Blank

Name___________________ Class______________ Date________

Fill in the blank with the appropriate term.

  1. Driving less is an example of fossil fuel __________.
  2. Cars that run on electricity and use gas only as a backup fuel are called __________ cars.
  3. A major problem with hydrogen cars is the lack of __________.
  4. A catalytic converter changes __________ in exhaust to nitrogen and oxygen gases.
  5. The aim of the Montreal Protocol is to protect the __________.
  6. The aim of the Kyoto Protocol is to control global __________.
  7. The main greenhouse gas causing global warming is __________.

Lesson 22.3: Critical Writing

Name___________________ Class______________ Date________

Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences.

Compare and contrast carbon taxation and carbon sequestration as ways of reducing carbon dioxide levels in the atmosphere.

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