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Air pollution<br />
Pollution: A situation whereby contamination occurs, causing ill-effects to humans and the natural environment<br />Pollut...
Carbon dioxide CO2<br />
Air consists of 0.03% CO2<br />
Why are people worried about increasing CO2 in the atmosphere?<br />CO2 is a greenhouse gas<br />Greenhouse gases trap hea...
Which picture (A or B) shows the Greenhouse Effect?<br />
Mitigation through increasing Carbon sinks-<br />Afforestation (planting trees)<br />Increase oceanic biomass (controversi...
Carbon monoxide (CO)<br />A colourless, odourless gas that is very poisonous.<br />Comes from combustion of fossil fuels, ...
Effects of Carbon monoxide CO<br />
Nitrogen oxides (NOX)<br />2 MOLECULES - nitric oxide (NO) and nitrogen dioxide (NO2)<br />NO2 is more toxic than NO<br />...
Effects of Nitrogen oxides NOX<br />
NOx- Damage to vegetation<br />http://www.sciencecodex.com/test/sciencecodex-zq0AueAxXHXMwINL.jpg<br />
Sulphur dioxide (SO2)<br />Comes from the combustion of fossil fuels for power generation & motor vehicles<br />Nasty (bad...
Effects of Sulphur dioxide -SO2<br />
SO2<br />http://www.airqualitynow.eu/imgs/visuels/Domestic_and_industrial_air_pollution.jpg<br />
Where does lead (Pb) come from?<br />Batteries<br />Lead smelters<br />Old paint (pre-1970)<br />Leaded petrol<br />Lead p...
Lead (Pb)<br />
A house painter affected by chronic lead poisoning. Wasted muscles and wrist drop are tell-tale symptoms of lead poisoning...
Particles<br />Dust<br />Pollen<br />Sea salt<br />Viruses<br />Bacteria <br />
The smaller the particle, the more easily it can be inhaled into the body and cause problems.<br />Particles with a  diame...
Ozone    O3<br />Good ozone (17-50km from ground level) –protects earth from harmful UV rays<br />Bad ozone (below 17km-gr...
CFCs<br />Chlorofluorocarbons<br />Used as coolants, insulation and propellants in aerosols, foam and refrigerants (known ...
Methane CH4<br />Colourless, odourless<br />Methane is over 20 times more effective in trapping heat in the atmosphere tha...
Where does Methane come from?<br />Anaerobic decomposition of organic matter in soils & landfill<br />Coalmining<br />Agri...
Indoor air pollution<br />Pollutants can be more concentrated indoors than outdoors.<br />Build up of indoor pollutants ca...
Effects of indoor air pollution<br />
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Air Pollution

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Transcript of "Air Pollution"

  1. 1. Air pollution<br />
  2. 2. Pollution: A situation whereby contamination occurs, causing ill-effects to humans and the natural environment<br />Pollutant: An agent that causes pollution<br />
  3. 3. Carbon dioxide CO2<br />
  4. 4. Air consists of 0.03% CO2<br />
  5. 5.
  6. 6. Why are people worried about increasing CO2 in the atmosphere?<br />CO2 is a greenhouse gas<br />Greenhouse gases trap heat in the atmosphere<br />Trapped heat causes climate change<br />Climate change is expected to bring about an increase in extreme weather events such as hurricanes, drought and flooding, as well as a rise in sea levels.<br />
  7. 7. Which picture (A or B) shows the Greenhouse Effect?<br />
  8. 8.
  9. 9. Mitigation through increasing Carbon sinks-<br />Afforestation (planting trees)<br />Increase oceanic biomass (controversial)<br />Decreased energy use<br />Renewable energy sources, e.g. solar, wind<br />Sequestration (e.g. injecting Carbon into lithosphere)<br />
  10. 10. Carbon monoxide (CO)<br />A colourless, odourless gas that is very poisonous.<br />Comes from combustion of fossil fuels, e.g. vehicle tailpipes, smoke stacks, gas stoves <br />A precursor to greenhouse gases <br />Carbon monoxide elevates the concentrations of methane (a powerful greenhouse gas) and ozone in the atmosphere. <br />CO eventually oxidises into carbon dioxide.<br />
  11. 11. Effects of Carbon monoxide CO<br />
  12. 12. Nitrogen oxides (NOX)<br />2 MOLECULES - nitric oxide (NO) and nitrogen dioxide (NO2)<br />NO2 is more toxic than NO<br />Occurs naturally from lightning strikes, bacteria and volcanoes<br />Manmade sources includes fossil fuel combustion (transport & power generation) & agriculture (esp. synthetic fertilisers) <br />
  13. 13. Effects of Nitrogen oxides NOX<br />
  14. 14. NOx- Damage to vegetation<br />http://www.sciencecodex.com/test/sciencecodex-zq0AueAxXHXMwINL.jpg<br />
  15. 15. Sulphur dioxide (SO2)<br />Comes from the combustion of fossil fuels for power generation & motor vehicles<br />Nasty (bad) smell – like burnt matches<br />Colourless gas<br />
  16. 16. Effects of Sulphur dioxide -SO2<br />
  17. 17. SO2<br />http://www.airqualitynow.eu/imgs/visuels/Domestic_and_industrial_air_pollution.jpg<br />
  18. 18. Where does lead (Pb) come from?<br />Batteries<br />Lead smelters<br />Old paint (pre-1970)<br />Leaded petrol<br />Lead pipes<br />Some agro-chemicals<br />Car radiators<br />Products from China<br />
  19. 19. Lead (Pb)<br />
  20. 20. A house painter affected by chronic lead poisoning. Wasted muscles and wrist drop are tell-tale symptoms of lead poisoning.<br />http://www.osh.dol.govt.nz/kidz/gore/lead.shtml<br />
  21. 21. Particles<br />Dust<br />Pollen<br />Sea salt<br />Viruses<br />Bacteria <br />
  22. 22. The smaller the particle, the more easily it can be inhaled into the body and cause problems.<br />Particles with a diameter less than 10µm can be inhaled<br />Particles can carry other pollutants, e.g. SO2<br />Particles can exacerbate respiratory illnesses such as asthma, hay-fever<br />
  23. 23. Ozone O3<br />Good ozone (17-50km from ground level) –protects earth from harmful UV rays<br />Bad ozone (below 17km-ground level) –can combine with water vapour to produce smog; causes respiratory problems, skin inflammation and can also decrease plant productivity<br />
  24. 24. CFCs<br />Chlorofluorocarbons<br />Used as coolants, insulation and propellants in aerosols, foam and refrigerants (known a “Freons”)<br />CFCs remain in troposphere for a long time<br />Eventually CFCs find their way to the stratosphere where the UV rays cause the Cl to destroy countless O3 molecules<br />This process has resulted in a huge hole on the ozone layer<br />CFCs can also cause sore eyes, dry skin & irregular heartbeat<br />CFCs are banned in the UAE from January 2010<br />
  25. 25. Methane CH4<br />Colourless, odourless<br />Methane is over 20 times more effective in trapping heat in the atmosphere than carbon dioxide (CO2)<br />
  26. 26. Where does Methane come from?<br />Anaerobic decomposition of organic matter in soils & landfill<br />Coalmining<br />Agriculture<br />Wastewater treatment<br />Natural gas (methane is the primary constituent)<br />
  27. 27. Indoor air pollution<br />Pollutants can be more concentrated indoors than outdoors.<br />Build up of indoor pollutants can cause “sick building syndrome”<br />Indoor pollutants can come from paints, sprays & solvents, electrical equipment & printers<br />Volatile organic compounds (VOCs) can result in eye, nose, and throat irritation; headaches; loss of coordination; nausea; damage to liver, kidney, and central nervous system; cancer. <br />Good ventilation is essential.<br />
  28. 28. Effects of indoor air pollution<br />
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