Answer:
(i) Localized environmental health problems such inadequate household water and sanitation and indoor air pollution.
(ii) City - regional environmental problems such as ambient air pollution, inadequate waste management and pollution of rivers, lakes and coastal areas.
(iii) Extra - urban impacts of urban activities such as ecological disruption and resource depletion in a city?s hinterland, and emissions of acid precursors and greenhouse gases.
(iv) Regional or global environmental burdens that arise from activities outside a city?s boundaries, but which will affect people living in the city.
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