First of all, I'd like to touch on the background
of this study.
As you know well, persistent organic pollutants (POPs)
representing polychlorinated dibenzo-p-dioxins, dibenzofurans,
PCBs, and organochlorine insecticides are lipophilic stable
They have been detected in a wide range of environmental
media and biota, and have been of great concern on their
toxic effect on humans and wildlife.
In developed countries, comprehensive investigations on
the POPs pollution have been documented well, and made clear
that environmental residue levels have been decreasing in
recent past decades.
However, in developing countries, fewer information are
available on the pollution of these contaminants, particularly
dioxins and its related compounds.
Dumping Site in India
This is a same view in India.
Large scale dumping of municipal wastes is common in the
urban regions of many developing countries.
Variety of wastes including plastics, metals, papers, woods
and raw materials are dumped in large open land areas.
Burning of Dumps
The major problem here is burning of wastes at low temperatures
due to the generation of methane gas.
As you guess now, the burning of wastes forms dioxins.
sites of municipal wastes in Asian developing countries
may be expected as the sites of secondary formation of dioxins
and related compounds, because huge amounts of various wastes
have been dumped daily and continuously burned under low
temperature by spontaneous combustion or intentional incineration.
Also, the usage of organochlorine insecticides at these
sites for public health purposes is unavoidable, because
of serious hygenic problems in dumping sites.
Therefore, it is suspected that pollution sources are present
in dumping sites, and many residents around there might
be exposed to these contaminants.