1. Ch. 8.2 Air Pollution and Solutions
Land, Air, and Water Resources
Ms. De Los Rios
7th Grade
Ch. 8.2 Air Pollution and Solutions
Essential Question:
How Do People use Earth’s Resource?
What Causes Outdoor and Indoor Air Pollution?
What Causes damage to the Ozone Layer?
How can Air Pollution be Reduced?
Pgs

2. Vocabulary Emissions- are pollutants released into the air.
Photochemical smog- is thick brownish haze formed when certain gases in the air react with sunlight.
Ozone- a form of oxygen that has 3 oxygen atoms in each molecule instead of the usual 2 (toxic to organisms where it forms near Earth’s surface.)
Temperature inversion- a layer of warm air prevents rising air from escaping.
Acid rain- precipitation that is more acidic than normal because of air pollution.
Radon- is a colorless odorless gas that is radioactive.
Ozone layer- the layer of the upper atmosphere about 30 km above Earth’s surface
Chlorofluorocarbon- (CFC) human made gases containing chlorine and flourine that are the main cause of ozone depletion.

3. What Causes Outdoor and indoor Pollution? Pg. 261
Outdoor Air Pollution
You can’t see it, taste it, or smell it, but you are surround it by it! What is it?
AIR
____ is a mixture of gases that cycle between living things and the atmosphere.
Emissions are pollutants released into the air.
A large source of emissions resulting in air pollution outdoors comes from motor vehicles such as cars and trucks.
In addition, factories, power plants, and natural sources (methane from cows) cause air pollution. r. last p

4. Smog pg. 262
Photochemical smog is a thick, brownish haze formed when certain gases in the air react with sunlight.
It can cause:
breathing problems
eye and throat irritation
The major sources of smog are the gases emitted by cars & trucks
These gases react in the sunlight and produce ozone, a toxic form of oxygen.
Ozone can cause:
Lung inf. & damage the body’s defenses against infections.

5. Smog pg. 262
Temperature inversion- a layer of warm air prevents rising air from escaping.
During Temperature inversion, a layer of warm air prevents the rising air from escaping. The polluted air is trapped and held close to Earth’s surface. The smog becomes concentrated and dangerous.
Figure 2

6. Acid Rain pg. 263
Precipitation that is more acidic than normal because of air pollution is called acid rain.
Acid rain damages plants, waterways, and metals and stones.
Acid rain can also take form of:
Snow, sleet, or fog
A.R. is caused by:
Power plants & factories that burn coal and oil that produce nitrogen oxides and sulfur oxides when they are burned.
r. Pg 263
Apply iT!!!!
Fig. 3
In the text underline the cause of acid rain.

7. Air Pollution and Solutions pg. 264
Indoor Air Pollution
Indoor air pollution has many sources.
Even indoor air can be polluted. Some substances that cause indoor air pollution, such as dust and pet hair, bother only those people who are sensitive to them. Other indoor air pollutants, such as toxic chemicals, can affect anyone. Radon is a colorless, odorless gas that is radioactive.
Assess your Und.
Fig. 4
Circle the sources of indoor air pollution in this room.

8. Ozone is a pollutant (r. p. 2/3)
Fig. 5 Air Pollution and Solutions pg. 265
Ozone Cycle
The ozone cycle prevents harmful ultraviolet
radiation from reaching Earth’s surface.
The ozone layer is a layer of the upper atmosphere about 30 kilometers above Earth’s surface. It protects people from the effects of too much ultraviolet radiation. (protects people from sunburn, eye disease, & skin cancer)
Ozone is a pollutant (r. p. 2/3)
Ozone is constantly being made and destroyed as part of the ozone cycle.
Each time the cycle occurs, UV energy
Is absorbed!
Read Fig. 5
Cycle begins here

9. What Causes Damage to the Ozone Layer? pg. 265
The amount of ozone in the ozone layer is decreasing, creating an ozone hole. Scientists determined that the major cause of the ozone hole is a group of gases called chlorofluorocarbons, CFCs.
Chlorofluorocarbon- (CFC) human made gases containing chlorine and flourine that are the main cause of ozone depletion. Sprays, a/c, household products contain CFCs. Most uses of CFCs were banned in 2000.

10. Fig. 7 266 Air Pollution and Solutions pg. 266
Ozone and Ultraviolet Radiation
The amount of ozone in the atmosphere and the amount of UV radiation reaching Earth are linked.
Label which curve represents ozone and which represents UV radiation?
Explain the graph in your own words.
____________________________________________________________________________________

11. What’s Being Done pg. 267 Ban on CFCs products 2000
Some products are still allowed
CFC molecules remain in the atmosphere
Scientist predict that ban will allow the ozone layer to gradually recover
Researcher have develop ways to make products without using CFCs
The substitutes that were developed, are less harmful than CFCs

12. How Air Pollution Can be Reduced?
The key to reducing air pollution is to control emissions.
Factories and vehicles use devices and systems to reduce emissions.
Individuals can reduce air pollution by using electricity and motor vehicles less.
Figure 8

13. Where Does an Apple Really Come From?
Fig. 9 Air Pollution and Solutions pg. 269
Where Does an Apple Really Come From?
Many things in our everyday lives, even where food comes from, can contribute to air pollution.

14. Air Pollution and Solutions pg. 269
Analyze Costs and Benefits
What are the pros and cons of buying apples that were grown locally instead of those grown in another country?
Assess your Und.
I know the key to reducing air pollution is_____________________________________________________________________________________