In general the types of fuel used become
cleaner and more convenient, efficient and costly as
people move up the energy ladder (6). Animal dung,
on the lowest rung of this ladder, is succeeded by crop
residues, wood, charcoal, kerosene, gas and electricity.
People tend to move up the ladder as socioeconomic
conditions improve. Other sources of
indoor air pollution in developing countries include
smoke from nearby houses (6), the burning of
forests, agricultural land and household waste, the
use of kerosene lamps (7), and industrial and vehicle
emissions. Indoor air pollution in the form of
environmental tobacco smoke can be expected to
increase in developing countries. It is worth noting
that fires in open hearths and the smoke associated
with them often have considerable practical value, for
instance in insect control, lighting, the drying of food
and fuel, and the flavouring of foods (3).
In general the types of fuel used become
cleaner and more convenient, efficient and costly as
people move up the energy ladder (6). Animal dung,
on the lowest rung of this ladder, is succeeded by crop
residues, wood, charcoal, kerosene, gas and electricity.
People tend to move up the ladder as socioeconomic
conditions improve. Other sources of
indoor air pollution in developing countries include
smoke from nearby houses (6), the burning of
forests, agricultural land and household waste, the
use of kerosene lamps (7), and industrial and vehicle
emissions. Indoor air pollution in the form of
environmental tobacco smoke can be expected to
increase in developing countries. It is worth noting
that fires in open hearths and the smoke associated
with them often have considerable practical value, for
instance in insect control, lighting, the drying of food
and fuel, and the flavouring of foods (3).
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