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Air Pollution - PowerPoint PPT Presentation

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Air Pollution. what is air pollution?. Particulate matter Very small particles of fuel that has been burned. Ex, diesel smoke Noxious gases Chemicals that can cause harm directly, or react with other chemicals to do damage. Smog demo?. smog. What is it?

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Presentation Transcript
what is air pollution
what is air pollution?
  • Particulate matter
    • Very small particles of fuel that has been burned. Ex, diesel smoke
  • Noxious gases
    • Chemicals that can cause harm directly, or react with other chemicals to do damage.
  • What is it?
    • a hazy mixture of pollutants in the air, primarily made up of ground-level ozone.
  • What causes it?
    • When sunlight causes volatile organic compounds (VOCs) to react with nitrous oxide. This produces ozone.
temperature inversion
Temperature inversion
  • occurs when air close to the earth is cooler than the air above it. (hot on top, cold on bottom)
  •  Under these conditions, pollution cannot rise and be dispersed. It is trapped on the surface, where humans breathe it.
acid rain1
Acid rain
  • When a pollutant, such as sulfuric acid combines with droplets of water in the air, the water (or snow) can become acidified .
effects of acid rain
Effects of acid rain
  • Acid rain erodes stones and statues, harms plant life, and can acidify lakes and streams.
atmosphere composition1
Atmosphere composition
  • Troposphere – 0-15km . This is the air we live in and breathe; weather occurs here.
  • It’s name comes from Greek ‘trope’ meaning ‘to turn over.’
atmosphere composition2
Atmosphere composition
  • Stratosphere – 15-50km
  • Ozone layer is here; absorbs radiation.
  • No weather, so airplanes fly in the stratosphere.
atmosphere composition3
Atmosphere composition
  • Mesosphere – 50-85km
  • Air thins out; gets very cold. Coldest place on earth at -150 F
  • Meteors burn up here (“shooting stars”)
atmosphere composition4
Atmosphere composition
  • Thermosphere – 85-500 (can vary 350 to 800km)
  • Almost no air here; expands and contracts as the sun heats it
  • low gravity; space shuttle and ISS orbit here.
  • auroras
atmosphere composition5
Atmosphere composition
  • N - 78%
  • O – 20%
  • Ar – 1%
  • CO2 - .05% a little bit can have a big effect!
  • Other - .05% including Neon, Helium, Methane, Krypton
  • How much does the atmosphere weigh?
    • Approx. 5.5 quadrillion tons!
class atmosphere
Class Atmosphere

(see slide notes)

greenhouse effect1
Greenhouse effect
  • What is it?
    • When gases (notably CO2) act like a blanket to hold heat close to the earth.
  • Why do we care?
    • Changes of even a few degrees can have big effects. Ex, raising sea levels,
greenhouse debate
Greenhouse debate
  • Watch two debates
  • Write down arguments in favor of each side.
ozone depletion
Ozone depletion
  • What is ozone?
  • chlorofluorocarbons(CFC's) come from aerosol cans, cooling systems and refrigerator equipment.
  • CFCs react with ozonemolecules, creating "holes” and allowing radiation to reach the earth.
health effects of atmospheric pollution
Health effectsof atmospheric pollution
  • short-term effects include irritation to the eyes, nose and throat, and upper respiratory infections such as bronchitis and pneumonia.
  • Long-term includes chronic respiratory disease, lung cancer, heart disease, and even damage to the brain, nerves, liver, or kidneys.