1. What is wrong with this picture?

2. Aim: What are the major causes of air pollution?

3. 1. Air pollution: any substance in the atm that is harmful -can occur naturally or by human activities

4. 2. Natural sources of pollution:
a. Volcanoes can put particles into the air (dust, ash, smoke)
b. Forest Fires
c. salt from oceans
d. dust storms and soil erosion
e. pollen and molds

5. 3. Human Activity:
Most air pollution is the result of burning fossil fuels
Examples:
- Gasoline in cars
- Power plants
- Factories
Over farming soil erosion

7. 4. What are fossil fuels?
fuel made from the remains of living organisms compressed over millions of years.
Examples:
-Oil
-Natural Gas
-Coal
-petroleum

8. 5. Aerosols in the air
Particles from volcanoes, forest fires, and soot block sunlight affects temperature on Earth
contributes to formation of clouds also affects temp

9. Soot
Black particles that are made from burning fossil fuels

10. 6. Photochemical Smog
Sunlight reacts with chemicals from burning fossil fuels to make smog.
A dangerous ingredient in smog is ground level ozone.
c. Smog irritates breathing, damages plants & algae, destroys plastics & rubber

11. Is Ozone good or bad? Why is it good in the stratosphere?
Why is it bad close to the ground?

12. 7. Stratospheric vs. ground ozone
a. Stratospheric ozone absorbs the damaging UV rays of the sun ;-)
b. Ground ozone is a part of smog and contributes to air pollution ;-(

13. * Ozone: Good up high, bad nearby

14. Air Quality Index
AIRNow – Home

15. What is the #1 cause of smog?

16. What’s eating the ozone?

17. 8. Ozone hole a. Over Antarctica
b. Chlorofluorocarbons (CFCs) used in refrigerators, air conditioners and aerosol cans break up the O3 molecules
c. CFCs were banned in 1998
d. Ozone layer will naturally be repaired

18. Why over Antarctica?
Cold temperatures speed up the destruction of ozone

19. The ozone “hole” is more like a bald spot… it’s thinning but not completely gone.

20. a. precipitation is naturally acidic
9. Acid Precipitation
a. precipitation is naturally acidic
Acid Rain

21. What is the pH of “normal” rain?
pH of 5.6 because of dissolved CO2 in it

22. What is an acid?

23. b. Burning of fossil fuels releases sulfur dioxide (SOx) and nitrogen dioxide (NOx).
c. Moisture in the air reacts with these chemicals to produce sulfuric and nitric acid.

25. d. causes Chemical weathering

26. e. affects ecosystems

27. f. turns plants brown
-pine needles fall off

30. 10. Global Warming burning fossil fuels releases CO2 into atm
it acts as a blanket and traps heat in our atmosphere (greenhouse effect)

32. Summary: Explain why some states may display this message to commuters.

34. Acid Rain Review
acids and bases
Air pollution