Environmental issues of urban change

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  • Environmental issues of urban change
    • Environmental issues of urban change
      • Atmospheric pollution
      • Traffic congestion
      • Water pollution
      • Urban dereliction
      • Waste disposal
    • Atmospheric pollution
      • Issues in developing areas, particularly industrialising cities
      • Measured in ppm of particulates less than 10 micrometers big
      • WHO syas anything over 160 ppm is a health risk
      • Caused by industry, poor transport, and temperature inversion.
      • Air pollution in Dhaka
        • Worse than Mexico City and Mumbai
        • Average ppm is higher than WHO guidelines
        • 8% of children and 16% of adults have respiritory problems
        • Brick manufacturing contributes 30%
        • 100 new vehicles on roads each day
        • 700000 rickshaws, of which only 75000 are legal
        • Conjestion due to unplanned road excavation
      • London
        • Levels reduced in last 50 years
        • 1956 clean air act
        • De-industrialisatio
        • Coal not used as widely
        • Laws on vehicle emissions and low emissions zone
    • Water pollution
      • UN says that in the worlds poorest countries, people have access to 30 litres of water or less per day.  The minimum is considered as 50
      • Dhaka
        • Illegal dumping of waste in rivers
        • Inadequate sewage systems
        • Industry dumps waste and chemicals
        • Lack of requlations and laws
        • Lack of infrastructure
      • London
        • 95% of properties have piped sewage systems, rest have sceptic tanks
        • All dwellings have safe piped water
        • Main issue is water consumption
        • Driest part of the UK
        • London aquifwer is depleting
        • Thames pollution levels have dropped
    • Waste disposal
      • Dhaka
        • Inadequate waste disposal
        • 3.5 million tonnes of MHW per year
        • One quarter of MHW gets dumped on roadsides, rivers and unused land
      • London
        • 3/4 of waste is exported to landfill sites in southeast
        • 500 collection vehicles, 18 lanfilss, 2 incinerators, 23 recycling centres
        • 4.4m tonnes of MHW per year
        • Landfilss create methan
    • Dereliction
      • De-industrialisation
      • Lack of political will or monay from authorities
      • Decentralisation of industry
      • London
        • Mainly East London following de-industrialisation
        • Recent regeneration
        • Aims for brownfield evelopment
      • Dhaka
        • Lots of derelict land
        • Mostly redundant tanneries
        • Little investment in regeneration
        • Many derelict sites becoming occupied by squatters
        • Used as illegal rubbish dumps

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