1. Air Pollution http://www.youtube.com/watch?v=X6uylG4nkVQ

3. What is Air Pollution? Some gases Aerosols: microscopic liquid and solid particles –Dust –Carbon –Pollen –Sea salts –microorganisms

4. Composition of the Atmosphere ComponentConcentration (vol %) Constant Nitrogen, N 2 78.08 Oxygen, O 2 20.95 Argon, Ar0.93 Neon, Ne0.0018 Helium, He0.0005 Hydrogen, H 2 0.00005 Variable Water, H 2 O0 to 4 Carbon Dioxide, CO20.036 Methane, CH 4 0.00017 Ozone, O 3 0.000004 Carbon Monoxide, CO0.000002 Other< 0.000002

5. What Factors Determine the Level of Air Pollution? Quantity of pollutants entering air Space into which pollutants disperse Removal of pollutants

6. Removal of Pollutants: Hydroxyl Radical

7. Two Kinds of Smog (smoke+fog) Industrial Smog: –Combination of smoke and fog –Depends on concentration of industry –Coal as primary energy/heating source –China, Korea, Eastern Europe –Combination of soot, sulfurous compounds, water vapor Photochemical Smog: –Auto exhaust + sunlight –Starts in AM, dissipates in PM –LA, NYC, etc

10. Weather Conditions Can Make Smog Worse: Inversion

11. Air Pollution Disasters Donora, PA: Smog of 1948 – ½ town population sickened – 20 dead London: Great Smog of 1952 – 4000 dead http://www.youtube.com/watch?v=3PO_3exwN-I