Chapter 5Chapter 5

Air PollutionAir Pollution

Air and Water ResourcesAir and Water ResourcesChapter 5Chapter 5

Air PollutionAir Pollution

Guiding QuestionsGuiding Questions

What is air pollution and how is it What is air pollution and how is it dangerous?dangerous?

How does Photochemical smog form?How does Photochemical smog form? How does the ozone layer protect people?How does the ozone layer protect people? Give three examples of indoor air pollutants Give three examples of indoor air pollutants

and list their sources.and list their sources. What is the greenhouse effect and how does What is the greenhouse effect and how does

it help us?it help us? Why is global warming dangerous?Why is global warming dangerous?

Main IdeasMain Ideas Air pollutionAir pollution is a change to the is a change to the

atmosphere that has harmful effects . atmosphere that has harmful effects . Substances that cause pollution are called Substances that cause pollution are called pollutants. pollutants.

Main IdeasMain Ideas Photochemical smogPhotochemical smog is a thick brownish haze formed is a thick brownish haze formed

when certain gases in the air react with sunlight.when certain gases in the air react with sunlight. The major sources of photochemical smog are the gases The major sources of photochemical smog are the gases

emitted by motor vehiclesemitted by motor vehicles

Main IdeasMain Ideas Sources of indoor air pollution include Sources of indoor air pollution include

smoke, dust, pet hair, and asbestos. Two smoke, dust, pet hair, and asbestos. Two dangerous pollutants that are very difficult dangerous pollutants that are very difficult to detect are carbon monoxide and radon.to detect are carbon monoxide and radon.

Main IdeasMain Ideas

The The ozone layerozone layer is a layer of the upper is a layer of the upper atmosphere about 30 kilometers above atmosphere about 30 kilometers above Earth’s surface. Yet even the small amount of Earth’s surface. Yet even the small amount of ozone in the ozone layer protects people from ozone in the ozone layer protects people from the effects of too much ultraviolet radiation.the effects of too much ultraviolet radiation.

OzoneOzone is the major, toxic chemical found in is the major, toxic chemical found in smogsmog

Gases containing Gases containing CFC CFC (chlorofluorocarbons)(chlorofluorocarbons) create a hold in the create a hold in the ozone layer. Why is this bad? ozone layer. Why is this bad?

Main IdeasMain Ideas

A A temperature temperature inversioninversion is when a is when a layer of warm air layer of warm air prevents the rising air prevents the rising air from escaping. The from escaping. The polluted air is trapped polluted air is trapped and held close to Earth’s and held close to Earth’s surface. The smog surface. The smog becomes more becomes more concentrated and concentrated and dangerous. dangerous.

Main IdeasMain Ideas Precipitation in an acidic form is Precipitation in an acidic form is

called acid rain. It is produced by called acid rain. It is produced by heavy pollution in the air. heavy pollution in the air.

Main IdeasMain Ideas

Gases in the Earth’s Gases in the Earth’s atmosphere such as atmosphere such as water vapor and water vapor and carbon dioxide prevent carbon dioxide prevent heat from escaping heat from escaping back into space. This is back into space. This is called the called the greenhouse effectgreenhouse effect..

Main IdeasMain Ideas Global warming is the theory that predicts Global warming is the theory that predicts

that carbon dioxide will cause the average that carbon dioxide will cause the average temperature to continue to rise. What temperature to continue to rise. What problems could this cause. problems could this cause.