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Air Pollution

Air Pollution. SOURCES of pollution an analogy Point sources Non-point sources Easy to point out : Hard to point at just one. Point Sources. Like giants big easy to spot e.g. factories e.g. power plants . Example of a point source (There it is!) .

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Air Pollution

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  1. Air Pollution

  2. SOURCES of pollution an analogyPoint sources Non-point sourcesEasy to point out : Hard to point at just one

  3. Point Sources • Like giants • big • easy to spot • e.g. factories • e.g. power plants

  4. Example of a point source(There it is!)

  5. Examples of non-point sources (Where?—All over.)

  6. What are non-point sources? • Like ants • small • all over the place, often moving • so many of them it is hard to POINT OUT all of them • e.g. cars • e.g. houses • e.g. construction sites • e.g. farms • e.g. fires

  7. air pollutants—Most result from burning fuels • excess carbon dioxide: CO2 ----sooo much more than natural • Ozone: ground level O3 (the bad ozone) • in urban smog; destroys our lungs; ozone alert days in summer (but our lives depend on good ozone way up in the stratosphere!) • Carbon monoxide: CO • reduces blood’s ability to carry O2 • product of incomplete combustion (bad old cars) • Nitrogen oxides: NOx • Sulfur Dioxide: SO2 • precursor to acid rain along with NOx • Particulate Matter • respiratory disorders

  8. CFCs—a success story? –maybe • Chlorofluorocarbons (CFCs) --an unreactive gas, seemed perfect as propellant • plastic foam • refrigerator equipment (old) • old spray cans • Eventually reached the ozone layer • destroyed good ozone --- ozone in the stratosphere. • Banned several years ago • too late? Is too much damage done? • the replacement chemicals—Are they ok?

  9. Natural Air Pollutants not here here! here! • Natural air pollutants can include: • Smoke from wild fires • Volcanic eruptions • Methane released from livestock

  10. Consequences of Air Pollution • decreased quality of life! • breathing sicknesses (asthma, emphysema) • acid rain • increased greenhouse effect, which leads to GLOBAL WARMING

  11. The Greenhouse Effect– a natural process, greatly exaggerated by us humans How is the greenhouse effect related to global warming?

  12. Acid Rain: Its effect on trees A smoggy city

  13. WAYS TO reduce AIR POLLUTIONand global warming • Everyone pollutes. • You can’t stop it, but you can reduce it. • What can you do? What are you willing to do? Some ideas: • Transportation: Walk, ride a bike, use public transportation, use cars less, get a more energy-efficient car • Buy only energy-efficient appliances • Re-use materials • Recycle newspaper, aluminum, others • Plant trees in urban areas • Don’t purchase products that contain CFCs • Support much stricter clean air laws • Support enforcement of international treaties to reduce ozone depletion and slow global warming • Don’t buy so much stuff!

  14. Air Pollution Guided NotesAnswer these. • Compare non-point sources and point sources of air pollution. 2. Give examples. 3. Which do you think cause worse problems in North Carolina? Why? • Do giants and ants really pollute the air? • Why are giants and ants referred to in the lesson on pollution? • Name 7 air pollutants caused by humans and tell what each pollutant does. • Name three air pollutants that are not caused by humans. • How is the greenhouse effect related to global warming? • Name ≥5 ways that you or your family could reduce air pollution. Be specific. Which ones are you willing to try?

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