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7.5 - Acid Deposition
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7.5 - Acid Deposition

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  • 1. Acid Deposition Acid deposition involves the deposition of both wet and dry acidic components
  • 2. Definitions
    • Wet deposition (acid rain) – rain or any other form of precipitation the is acidic. “Clean” or unpolluted precipitation has a ph of around 5.2; anything below this can be considered acidic.
    • Dry deposition – acidified particles and gases which are deposited directly from the air.
  • 3. Why do we get acid deposition?
    • The primary causes are the emissions of sulphur dioxides and nitrogen oxides into the atmosphere
    • These emissions lead to direct dry deposition or react in the air to produce sulphuric and nitric acids (acid rain)
    • These emissions come from power generation, vehicles and factories
    • Other sources include wildfires and volcanoes
  • 4.  
  • 5.  
  • 6. Impacts of Acid Rain
    • Acid rain can impact;
    • Surface water (rivers, lakes etc.) and aquatic animals
    • Soils
    • Forests and vegetation
    • Human health
    • Building and the urban environment
  • 7. A Trans-national Problem
    • The impact of acid deposition is therefore focused on areas with high levels of industrial and other pollutants – Western Europe and the USA for example.
    • Increasingly acid deposition will be a problem in rapidly developing areas such as China
    • Scandinavia has been badly affected by acid rain – why?
  • 8. Management Options
    • These include;
    • Technological fix
    • International treaties
    • Emissions trading
  • 9. You should;
    • Make notes on the link between pollution and the acid deposition that results (a flow diagram perhaps)
    • Research examples and case studies of the impacts of acid rain (e.g. Scandinavia)
    • Research and evaluate the strategies used to manage the problem; show an awareness of the trans-national nature of acid rain

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