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AIR POLLUTION (PowerPoint)

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AIR POLLUTION (PowerPoint) Powered By Docstoc
					Why there is air pollution?
 Concentrations of certain substances
  become high enough to toxify the
  atmospheric environment.
 More traffic
 Commercial activities
 Industrial activities
     Air pollution comes from three
              major sources

1.    Combustion-engine vehicles such as
      gasoline powered cars
2.    Industrial and community such as air
      condition or heating of homes and
      buildings
3.    Indoor sources such as tobacco smoke
 Hot weather and rising air
   helps disperse it
 Rainfall
   wash out certain pollutants in the air
 Temperature inversion
   traps air pollutants in lower atmosphere
 Still wind conditions
   inhibit effective dispersion of air
  pollutants
 Northerly wind prevails in Southern China
   make HK pollution more serious
                     Health Effects
API          Air         Health Implications
             Pollution
             Level
0 to 25      Low         Not expected
26 to 50     Medium      Not expected for the general population
51 to 100    High        Acute health effects are not expected but
                         chronic effects may be observed if you are
                         exposed to such levels persistently for a long time.
101 to 200   Very High   People with existing heart or respiratory illnesses
                         may notice mild aggravation of their health
                         conditions. Generally healthy individuals may also
                         notice some discomfort.
201 to 500 Severe        People with existing heart or respiratory illnesses
                         may experience significant aggravation of their
                         symptoms. There may also be widespread
                         symptoms in the healthy population (e.g. eye
                         irritation, wheezing, coughing, phlegm and sore
                         throats).
Environmental effect
How to control the air pollution?

1.   Reducing Emissions from Vehicles
    tighter fuel and vehicle emission standards
    cleaner alternatives to diesel
    control emissions from remaining diesels
     with devices that trap pollutants
    strengthen vehicle emission inspections and
     enforcement against smoky vehicles
    promote better vehicle maintenance and
     eco-driving habits
2. Reducing Emissions from
  Industrial Sources and Power Plants
   The Air Pollution Control Ordinance
       control emissions from power plants,
    industrial and commercial sources, etc

   A regulation introduced in 1990
      reduced sulphur dioxide pollution to very
    low levels

   Emissions from power plants have been
    substantially reduced over the years
Further suggestions for more effective control


£ Use clean technology:
 choose the production technologies which use
  minimum electricity, fuels and solvents
   reduces emissions of pollutant

£ Do not use aerosol consumer products:
 like hair sprays, furniture polish, pesticides


£ Use low solvent degreasers:
 use in the cleaning of oils, grease, or wax
   reduces emissions of volatile organic compounds
   reduces formation of ozone
Further suggestions for more effective control

£ Switch off engine while waiting:
   air pollution can be reduce,
   save fuels and money

£ Switch off the domestic appliances:
 turn off the fans and air-conditioner when you
  are not using

£ Use energy efficient domestic appliances:
 save energy light bulbs, refrigerators.
   reduce air pollution from the power station

				
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posted:12/9/2011
language:English
pages:12